"F.U.N. Song" is a song featured in the SpongeBob SquarePants episode "F.U.N." SpongeBob, convinced that Plankton just wants someone to be his friend, sings the song to describe what fun is to him.
Lyrics
[Speech]
SpongeBob: It's not about winning, it's about fun!
Plankton: What's that?
SpongeBob: Fun is when you... fun is... it's like... it's kind of... Sort of like a... What is fun? I... Let me spell it for you.
F is for friends who do stuff together
U is for you and me
N is for anywhere and anytime at all
Clams: Down here in the deep blue sea!
Plankton: F is for fire that burns down the whole town!
U is for uranium, bombs!
N is for no survivors when you--
[Speech]
SpongeBob: Plankton! Those thing aren't what fun is all about! Now, do it like this.
F is for friends who do stuff to--
[Speech]
Plankton: Never! That's completely idiotic!
SpongeBob: Here, let me help you.
F is for friends who do stuff together
U is for you and me... Try it!
Plankton: N is for anywhere and anytime at all
Clams: Down here in the deep blue sea!
[Speech]
Plankton: Wait, I don't understand this. I feel all tingly inside. Should we stop?
SpongeBob: No, that's how you're supposed to feel!
Plankton: Well, I like it! Let's do it again!
SpongeBob: Okay!
Both: F is for frolic through all the flowers
U is for Ukulele
N is for nose picking, chewing gum and sand licking
Here with my best buddy!