If you want to fool a group of people it's an easy way to do it in a public transport with a radio hole.

You and your friend preliminary arrange at what stop you will enter the transport and then you find out what stop is the next.

You enter the vehicle and after it starts its movement you shout very loudly into the hole so all the people could hear "Please, bring here something to eat, I'm damn starving!".

At the next stop your friend gets in and shouts: "Who ordered something to eat?". You say that it was you. He gives you a small piece of bread and butter. Then he lets you wash it down with a glass of water, you give him money and he gets out at the same stop or at the next one.

Then after a while you shout: "Now I'd like to take a cold shower". And then you look at the hole as if waiting for your order and try to take off your clothes watching the people around you starting to move backwards. What a funny expression they may have on their faces :-)