Suggesting an out-of-nowhere 'everyone breaks into song and dance' in the middle of a weird parody of Spaceballs the Writer's Craft class gave to the Drama class is one of the funniest.
And it only gets better when they take it. And your song is one that half said class recoils at: Caramelldansen. (Of course, the play itself was rather different. Focused around an intense desire to obtain Oregano out of a zealous worship of Pastafarianism.)
We had a class project in Writer's Craft (like English, but no Shakespeare and everything geared towards writing; like the writing version of art class) where we had to write a screenplay in five groups without collaborating between groups to make it completely whack. I decided that in our part, we should just slap in a completely random dance scene, and suggested Caramelldansen just to troll a bunch of the Drama students.
I'd link you to the whole thing, but when I checked the old site we posted on, it took me half an hour to find them and piece them back in the right order, filling in last-minute details and... it wasn't worth putting someone else through. @_@ It was a mess.