Penn & Teller are renowned magicians and they were at the TecCrunch50 too. Guess what they were up to at a place where struggling and enthusiastic new start ups display their innards? Well, they were playing a funny trick on everyone that chose to be tricked.

They have launched a new iPhone app which costs $1.99 and allows the app user to trick his friends or acquaintances into thinking he knows Penn and Teller personally. In order to do so, the user can ask his friend to pick out a card and declare that Penn & Teller would help him guess. With a couple of steps using the app on the iPhone, one can correctly guess the card.

If you would like to know how it really works, read the exhaustive post about the magical app on Tech Crunch. Though the magicians are not really looking for revenue, they sure hope to trick a lot of people using the app, and also help others trick their friends and acquaintances. I must say this was one of the more interesting and less heavy “start ups” at TechCrunch50.