It is a dark green wooden stand that SpongeBob built. It has two sticks that are attached to a wooden sign that reads "Bubbles 25¢" in red text. There are signs under the Bubblestand that display "Lessons 25¢." SpongeBob also offers lessons for beginners for only 25¢.
It is created by SpongeBob, but while doing so Squidward complains about the loud noise, so he does it slowly. As Squidward starting playing clarinet, SpongeBob starting rushing on it and finishes it.
Then, Patrick comes and tries it. He doesn't do so well, so SpongeBob places a sign saying "Lessons 25¢." He gets a lesson by watching a demonstration from SpongeBob. Squidward is annoyed by the racket and he comes down. He makes them feel ashamed and pushes them towards SpongeBob's house. When they are gone, he tries it but the two zoom back.
After many tries, SpongeBob shows him his special technique. Then, Squidward mimicks the technique and blows a bubble, but it's actually amazing.
He goes inside his house proudly, but then the bubble raises his house and pops, causing it to fall. SpongeBob and Patrick rushed into their houses before his house lands, and then the episode ends.