Niv - your third one was Legendary.
I like a simple, classic one. A Mentos ad, where a kid is late for class, so instead of walking straight in, he tries to sneak in while walking backwards. The sir catches him, thinks he is leaving, and tells him to get back in and return to his seat. Very clever.
Oh, and there is that Pepsi ad where a bunch of random people are interviewed about what they want to see in a Pepsi ad, and while they say what they want to happen, it happens.
And one involving the Black Eyed Peas where they keep falling through floors.
And the Nike (?) ad set in India, where, during some heavy traffic, a bunch of people start a game of cricket on the cars and trucks in the street. Fun.