"What are you doing?", asked the grandad. "You're 18 years old and wasting your life. When I was 18 I went to Paris, I went to the Moulin Rouge, drank all night, had my way with the dancers, pissed on the barman and left without paying. Now that is how to have a good time."
A week later, the grandfather comes to visit again. He finds the boy still in his room, but with a broken arm in plaster, 2 black eyes and missing all his front teeth.
"What happened?", he asked. "Oh Grandfather!", replied the boy. "I did what you did. I went to Paris, went...