Lyrics:

FUN SONG!
Spongebob:
What is fun
Let me spell it for ya
F is for friends who do stuff togeher
U is for U and me
N is for anywhere and anytime at all
Sea creatures:
Down here in the deep blue sea
Plankton:
F is for fire that burns down the whole town
U's for uranium... bombs
N is for no suvivors when you...
Spongebob:
Plankton those thing aren't what fun is all about
Now do it like this
F is for friends who do stuff to...
Plankton:
Never, that's completely idiotic
Spongebob:
Here let me help you
F is for friend who do stuff together
U is for U and me
TRY IT!
Plankton:
N is for anywhere and anytime at all
Sea Creatures:
Down here in the deep blue sea
Plankton:
Wait, I don't understand this... I feel all tingly inside. Should we stop
Spongebob:
That's how you're suppose to feel
Plankton:
Well I like it
Lets do it again
Spongebob:
OK!
Both:
F is for frolicking through all the flowers
U is for Ukulele
N is for nose picking sharing gum sand linking'
Here with my best buddy
(Laughing to music)