Money drop scam
This is a scam that is not really famous. If you see someone dropping money and other person get the money from the floor and offers to divide with you always reject the money. If you accept you gonna be able to walk a couple of minutes and then the "owner" of the money will back with some big friends and demand you to give all the money back. Since you just have 50% of the money you can imagine what's going to happen.