Is laughter contagious? You sure bet it is! If you've ever found yourself laughing just because someone else has got the giggles then you would agree on how contagious laughter can be! According to a new study (that we didn't need), laughter truly is contagious. We're sure you have that friend that brightens up the whole room and infects the people are ‘em by just laughing. Let's find out which friend has the most contagious laugh!