my friend show me. all u need is the side of a coin tat is just nice to fit into the can hole. and when he tap below. the coin stay down there of the can so it wont drop. is at the bottom at 21 sec den he face the bottom into him. next from 23 to 25 or 26 he drop it on his hand. 27 to 29 he move to side and turn the can and show u bottom. but the coin on his right hand. at 32 is still on his right hand. showing the there is not coin around. next he get close and knock or make some noise of the coin den he shake so there is gas. when he open. the coin drop in.and the gas cover it. so it look like is in from starting. thats all. pretty simple. anyone can do it.