but you decide to just sing a different song over the one playing/one you agreed on.
Them: Ooohhh, sunny dayysss, where have you gooone? I get the strangest feelin' you belong, WHY DOES IT ALWAYS RAIIN
You at the same time: ITS LIKE RAYEEAIIINNNNNNN ON YOUR WEDDING DAY!
I think that'd be the funniest thing of all time.