Chain Reaction Laughter

It's not nice to make fun of someone who has an unusual laugh, but there's a point when you can't help but laugh along when you hear it. And if you have an unusual laugh yourself, that doesn't make you immune to this natural reaction. A few years ago, a French TV show recruited a bunch of people with unusual laughs to appear all together. As soon as someone says something funny, one laughs and then they all laugh at the sound, until the entire studio sounds like a zoo uprising. The entire hour-long episode is here. (via reddit)