All of us dreamt in childhood to be famous artists, singers, etc. I dreamt to be a magician. Now I work in a computer company, my dream hasn't realized, though I can tell you one easy trick, which you can show your friends amazing them by your magic skills

The trick is good for a big company, the more people are involved, the better effect it will made on them. You put a glass of water on the table and cover it with a small mirror. Then turn around, so that you can not see it, and say that if any person now puts his finger-print on the mirror, you can easily tell who it makes. People gather round the table and one of them puts the finger on the mirror. You turn around ask everyone to put the forefinger in the water. Then come closer to each person and look attentively at their fingers. After that you can tell who left the finger-print.

Still have no idea how to guess? O'K, I'll tell you the secret. Before the whole action starts, you should talk one your friend into this