One day around lunchtime, while working and snogging the lips off his toy doll at the Krusty Krab, SpongeBob, gets a last minute order to serve a milkshake which he hasn't made in years. SpongeBob decides to make a simple milkshake in a blender, and finishes it off by topping whipped cream and a cherry while walking out the kitchen door. He serves it to Harold. But, Harold thinks it's horrible (and throws a temper tantrum, demanding a refund while angrily shoving the milkshake into SpongeBob's hat) and SpongeBob finds out that his milkshake I.D. has expired 7 years ago. So, Mr. Krabs forces him to go to the Milkshake Academy, where he meets Captain Frostymug.
Frostymug tells the cadets to man their milkshake stations. When SpongeBob mans his station, he realizes that there are more buttons and contraptions than he's used to, but thinks he still can make a milkshake with no problem. But when he tries to mix the milkshake, he repeatedly pushes the wrong button. Frosty Mug comes over and has a cadet inform SpongeBob that the controls are different and he has to push the button on the lower control panel. When SpongeBob manages to finally mix his milkshake, he lets Frosty Mug try it. However, when Frosty Mug tries it, the milkshake is frozen and it ends up in Frosty Mug's eye. Frosty Mug suggests they need to get back to the basics. Frostymug tells SpongeBob before he makes a milkshake, he needs to know what it feels like to be a milkshake. He makes him go in the Shake Simulator, which makes cadets who enter it into a milkshake-shaped blob. Frostymug sets the Simulator on "Obliterate", which makes the students gasp. A cadet reminds Frosty Mug that no one has ever survived Obliterate, to which he responds that he needs to learn. The simulator shakes, rattles, and rolls SpongeBob. Captain Frosty Mug decides to see how SpongeBob turned out and gets angry when he sees that he both survived and actually found it fun. Angry, Frosty Mug says that he's never had such an "unteachable moron" in 30 years. He asks his students to tell him how he could teach SpongeBob how to make a milkshake (with one student replying, "You'd be better off teaching a piece of coral, sir!", to which the students laugh at). SpongeBob replies that he'll show the students that he can make a milkshake. However, during the courses of making a milkshake, SpongeBob fails doing them all. During graduation, SpongeBob expects to get his milkshake license at this event. However, Captain Frosty Mug gives everyone milkshake licenses except for SpongeBob, because he couldn't even get past Step #1 of making a milkshake. SpongeBob tells Frosty Mug that he will keep trying. Captain Frosty Mug tells him he needs to put the milkshake up to the spinney thing. Then, he stops, flashing back to 20 years ago.
He was the owner of a milkshake cafe called Milk Shake. Many customers were so excited to have Frosty Mug's milkshakes. However, when he tried to make a milkshake for an eager customer, he ended up splattering the milkshake all over the store. A stain of milkshake got on the power lines that connect to the milkshake machine, destroying it. The milkshake machine squirted out milshake stains onto the customers, frightening them and ruining Frosty Mug's career. He informs SpongeBob that he hasn't touched the milkshake machine in 20 years. He gets his hand stuck in the machine. He is about to get his arm and all of him sucked into the machine, but SpongeBob is able to grab and save him just before the machine can suck him in. The machine ends up exploding, but Frosty Mug thanks SpongeBob for saving him. Thanks to the machine incident, Frosty Mug's arm is hurt. He realizes that he doesn't need a machine to make a milkshake and tells SpongeBob that a milkshake comes from within the heart. The next day, at the Krusty Krab, SpongeBob serves Harold a milkshake, which he replies is the best he's ever had. Everyone now wants to buy SpongeBob's milkshake. Captain Frosty Mug comes in, requesting a milkshake and gives SpongeBob his milkshake license to which SpongeBob replies, "If only it were this easy to get a boating license" and laughs, ending the episode.
According to the storyboard, while Captain Frostymug was falling, he was going to make a beard out of wipe cream.
This was mostly likely cut to save time. Also, he was originally going to have a red beard instead of a gray beard.
•Bikini Bottom Bound - Sage Guyton, Jeremy Wakefield [title card] •Vibe Sting - Nicolas Carr ["Double dip milkshake?"] • ? - Michael Bolger, Nicolas Carr [SpongeBob serves the milkshake] ‣Heavenly Voices (c) - David Farnon [cherry on top] •Drama Sting - Sage Guyton, Jeremy Wakefield [customer tries to drink the milkshake] • ? - Michael Bolger, Nicolas Carr ["This thing's frozen!"] ‣Drama Link (g) - Hubert Clifford ["...SEVEN YEARS AGO!"] • ? - Michael Bolger, Nicolas Carr [Krabs tells the customer to come back tomorrow] ‣Steel Sting (a) - Jeremy Wakefield [Krabs throws SpongeBob into his car] ‣Yankee Doodle - Larry Hochman [Krabs drops SpongeBob off] ‣Achievements in Aviation - Anthony W Mawer ["The Milkshake Academy!"] ‣Dragon Flight A - Daryl Neil Alexander Griffith [Captain Frostymug jumps out of a plane] ‣Military Parade A - Mladen Franko [Frostymug introduces himself] ‣Glory Road - Sam Fonteyn [Frostymug explains his purpose] •Steel Sting - Jeremy Wakefield [cadets laugh] ‣Glory Road - Sam Fonteyn ["This, Cadet SquarePants, is your scooper."] •Lap Steel - Nicolas Carr [cadets run around] ‣Cartoon Sting 12 - Gerhard Narholz [SpongeBob tries to make a milkshake] ‣ ? ["Sir, yes, sir!"] ‣Cartoon Sting 12 - Gerhard Narholz ["How silly of me."] • ? - Jeremy Wakefield [milkshake is frozen] ‣A Hero's Story (a) - Gregor F. Narholz [shake simulator] ‣Steel Sting (b) - Jeremy Wakefield ["That was fun, can I go again?"] ‣Steel Licks (c) - Jeremy Wakefield [Spongebob gets embarrassed] • ? - Fabian Fernandez, based on "Danger Zone" from Top Gun [training montage] ‣West Point - Larry Hochman [Frostymug giving milkshake licenses] •Vibe Sting - Nicolas Carr ["Um, the printer ran out of ink?"] ‣Tympup A - Sammy Burdson, John Charles Fiddy ["No, you simpleton!"] ‣Steel Licks (d) - Jeremy Wakefield [Frostymug refuses to give SpongeBob a license] ‣Terror Hunt - Phillip Green ["The spinny thing..."] ‣ ? [20 years earlier] ‣Red Alert - Harry Bluestone, Emil Cadkin [milkshake machine explodes] ‣Dramatic End - Harry Bluestone ["NO!"] ‣Epic Adventure - Dick Stephen Walter ["I'm stuck in the blender!"] ‣Shock Happening 2 - Harry Lubin [SpongeBob rescues Frostymug] ‣Legion of Honor - Harry Bluestone ["I'd like to tell you a secret."] •Lap Steel - Nicolas Carr ["Not at all."] ‣Sailor's Sting 4 - Michael Bolger, Nicolas Carr [back at the Krusty Krab] ‣V for Victory - Sam Fonteyn [Frostymug gives SpongeBob his milkshake license] ‣Steel Sting (f) - Jeremy Wakefield [ending]
Oddly in SpongeBob's milkshake license, his picture is shown while he is holding his spatula (since SpongeBob usually keeps his spatula at the Krusty Krab).
SpongeBob's milkshake license expired around the time of Selling Out. This could be a possible explanation as to why his license expired.
In one scene it was shown that SpongeBob made a krabby patty instead of a Milkshake. This is similar to Le Big Switch and SpongeBob You're Fired in which SpongeBob is unable to make anything other than a krabby patty.
It is unknown how Frostymug became a milkshake instructor if he does not even know how to use a milkshake machine.
It was said in Yours, Mine and Mine that SpongeBob has a Milkshake dispenser card and showed it to Patrick, although he does not have a Driver's License card.
The training montage is a parody of the movie Top Guns, with SpongeBob riding a motorcycle, flying in a fighter jet, and playing beach volleyball.
The episode's title is a reference to the James Bond film License to Kill.
The Milkshake Academy is an obvious parody to the Military Academy.
At the end, when SpongeBob says, "If only if were this easy to get a boating license!", the closed captions incorrectly translate, "If only it were this easy to get a voting license!".
When SpongeBob gave Harold the milkshake, Harold said it was frozen and when Harold put it in SpongeBob's Krusty Krab hat, it was not frozen. It was melted and squishy.
When SpongeBob drank the milkshake at the beach, he had gotten a milkshake mustache but when he poured the rest on his head and shook himself, it had disappeared.
Captain Frostymug said that SpongeBob couldn't even get past step number one of making a milkshake (filling the glass with ice cream). However it was shown numerous times that SpongeBob did in fact do this.
However, it could be just be an exaggeration for "SpongeBob can't make a milkshake".