While at a discount store one day, Mr. Krabs spots SpongeBob picking something up, and Mr. Krabs thinks it is a perfectly good penny, but he decides it was just a penny, so he forces himself to forget about it. But on the way home from town, every time he sees something circular, he keeps having visions of pennies, and becomes obsessed. The next day, he asks SpongeBob if he found anything, only for SpongeBob to reply that he found a brand new day, not a penny. Time and time again he tries to crack SpongeBob to give him the penny, like having him check all his pockets, and shaking him upside down but instead gets SpongeBob's brain out, until he finally builds a theater behind the Krusty Krab, and he makes admission a penny, so he will get SpongeBob's penny, but he does not have one, so in frustration, he destroys the theater. Mr. Krabs decides he will have a show at the Krusty Krab, to show how he does not have a penny, but SpongeBob still does not have one, so Mr. Krabs breaks. Later, he breaks into SpongeBob's house with a metal detector to find the penny, and when SpongeBob comes in, he shows him it was not a penny, but a chewed up piece of gum, for his gum collection. Mr. Krabs leaves and SpongeBob discovers that it is a five hundred dollar bill. Meanwhile, Mr. Krabs is still digging for the penny, all over Bikini Bottom.
I can turn into a skyscraper!
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Mr. Krabs opens a theatre right behind the Krusty Krab and a single movie inside.
This is the third out of the five times Mr. Krabs goes crazy just to get one penny. The first was in "Culture Shock" when he smells a penny in a tablet and he took off like a rocket destroying the table. The second was in "Born Again Krabs" where he almost tore a customer's arm off for one. The third was in "Imitation Krabs" where he chased a penny down the street leaving the Krusty Krab nearly unguarded. And the fifth time was in "Face Freeze!" where he tossed away a customer and messed up someone's Krabby Patty while looking for a penny.
The $500 bill shown at the end of this episode is no longer in circulation in real life, as it stopped circulating in 1934. The highest bill currently in circulation is $100.
Meaning SpongeBob's claim that the bill being useless is true.
It's revealed that SpongeBob is a brain whisperer in this episode.
When Mr. Krabs was looking at SpongeBob picking up a "penny," he was out of the line, though when he is told by the cashier that he is holding the line, he is right back in line.
The clerk already scanned a few items inside Mr. Krabs' grocery basket. After she asked for the price check on one item, the other items are inside Mr. Krabs' grocery basket again.