I have an even better coin trick.. Tell a person to hand over all of the change from their pockets into your hand. Then ask them to close their eyes and count to 50. When they open their eyes the coins and yourself have totally disappeared! (You need to sneak away slowly without making any noise in order to achieve total disappearance )
I learned that trick over 50 years ago as a kid and had completely forgotten about it. Thanks for the reminder.