If you haven't played Draw Something already, you need to. It's basically pictogram on your phone. You draw something and the other person has to guess. The game became so popular that it was the most viral mobile game ever. It was downloaded over 50 million times in 50 days. Within a month it was snapped by Zinga for a whopping $180 million. I bet the guys behind it didn't think they'd be multi-millionaires within the space of a month.