I think a funny montage-style video would be this: a guy walking around the city with headphones and a microphone and an auto-tune contraption attached to his belt, with everything plugged into it. And this guy is desperately, passionately singing at people on the street, but only he can hear himself being auto-tuned. The video absolutely has to cut back and forth from how HE hears himself in the headphones to what the hapless victims on the street hear. Bonus points if he jumps out if nowhere to surprise people with his performances.
Alright, people: you have your orders. 123GO.

321Go!