The Monster.com where the guy works with chimps. The best one is the whoopie cushion one. Those chimps crack up for real when he sits down.
The IT guys dancing to "push it real good"
The new Verizon commercial where the Dad says "for wherever you go" to his goth son. Then it shoes the son at a club and the Verizon tech is dancing.
To sum it up:
Monkeys/Chimps or guys dancing that normally wouldn't=hilarity.