It blows my mind how yawning is contagious! If someone yawns near u and u dont see them, nothing happens, if someone is 50 meters away and u see them yawning, u have to yawn!!!! If someone yawns on tv u dont get it though!

Its one of those things that drives me crazy! It makes no sense! Why does it happen?? Does the same thing happen to animals? And is it contagious from animals to humans or vice versa??!!?