The funniest reaction, I've ever seen.

Some hilarious reactions to a first encounter with an escalator.

Such a simple prank, such great reactions.

Her reaction is worth all the build up. Unless you're heartless.

Get a crazy reaction.

This is probably my favorite kiss cam reaction. Completely unexpected and absolutely hilarious.

Triggers chain reaction of exploding transformers.

Is absolutely hilarious.

This kid has the cutest/funniest reaction.

I love her reaction, from shock to pride in two seconds.

The prank isn't that funny, but her (over) reaction is hilarious.

Old fat ladies who don't wear any bras take this stuff too seriously, dude.

I had a similar reaction when I heard Jersey Shore was not going to be shot at Jersey!

Maury ain't seen nothin' like this before! Watch as these people lose their minds after finding out who the baby daddy is.

John McCain's reaction to the Dramatic Gopher crawling up his butt.

Watch the reaction of the Republican presidential candidates as they watch 2Girls1Cup during the YouTube debates.

2 Girls, 1 Cup, Infinite Reactions.

Jimmy Kimmel's audience reaction will help you laugh through hearing "Chocolate Rain" one last time. That's about 14 minutes Tay...

The paparazzi were surrounding Britney's car when she made the mistake of climbing into the back seat and flashing her panties. Their reactions are priceless.