Fun is a song from a episode Fun. Brandon sings it to bring Benson fun and Benson (Temporary) like Fun but in the end he dislikes it.
Brandon Buckingham: F is for friends who do stuff together U is for you and me N is for anywhere and anytime at all Down here in the deep blue sea!
Benson: F is for fire that burns down the whole town! U is for uranium...bombs! N is for no survivors when you--
[Speech] Brandon: Benson! Those thing aren't what fun is all about! Now do it like this.
F is for friends who do stuff to--
Benson: Never! That's completely idiotic! Brandon: Here, let me help you.
F is for friends who do stuff together U is for you and me... Try it!
Benson: N is for anywhere and anytime at all Down here in the deep blue sea!
Wait, I don't understand this. I feel all tingly inside. Should we stop?
Brandon: No, that's how you're supposed to feel!
Benson: Well, I like it! Let's do it again!
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!
Benson: Fun is such a stupidity, Fun is nothing but a worthless, annoying thing in my life!!!
Brandon Buckingham (spoken): but, Ben-
Benson (spoken) = Silence!!!not a word!! This has gone to far, say good bye to your good boss i'm now...NORMAL!!!!!!!!!!!