3 greeks and 3 turks travelling in the same direction by train, the turks buy 3 tickets but the greeks buy just 1, the turks say "how far can you get for just 1 ticket?",the greeks say "watch and you will see". so when they are on the train the greeks all cram into 1 bathroom, when the ticket collector comes around he knocks on the door and says "ticket please", so 1 greek puts his hand out with the ticket and he carries on, the turks find this clever so on the way back they buy only 1 ticket whilst the greeks buy none, so all the greeks cram into 1 bathroom and the turks cram into the other, then, 1 greek exits his bathroom knocks on the turks door and says "ticket please"