Discover the hilarious psychology behind pranks and practical jokes. Find out what happens when people are scared into fight or flight, offered unusual VIP services, and when their person space is invaded.

Discover the hilarious psychology behind pranks and practical jokes. Find out what happens when you see what's not there, over-sympathize with strangers, and fight back against authority.

Watch what happens when walking on water makes you feel a little woozy, when your mind transports soda through thin air, and when you're forced to hear a couple's intimate conversation about sausages.

Revel in the ridiculousness when a marriage proposal goes down the drain, a stranger falling into your lap, and a voodoo doll creeping you out like you've ever seen.

Check out the hilarious psychology behind strangers lying to save a man's marriage, a taste test gone terribly wrong, and an outrageous VIP laundromat experience.

Watch what happens when a stunt driver goes in disguise to take a driver's test, when a stranger gets way too close for comfort, and a movie trailer voice-over guy narrates people's lives walking down the street.

Check out the hilarious psych behind having your space invaded by a life-size teddy bear, and runway host, and ridiculous close-talker.

Watch what happens when a baby floats away with balloons, a car alarm gets personal, and some tough guys get more than they bargained for.

What would you do if a stranger popped a kid's balloon, or popped you the question?