A young man who wants to loose weight goes in a therapy center. He sees on the billboard:
"Formula 1: 3000$. 50% of success assured.
Formula 2: 6000$. 100% of success assured !"
The man talks to the director and chooses the 3000$ formula. The director brings him in a park, and asks him to run. The young man starts to run, when he sees a wonderful naked woman, carrying a placard: "Catch me and fµck me!". The man runs very, very fast, but he cannot catch the woman. After the race, he realizes that he didn't even loose 100 grams.
So he gets back to the center, and pays for the 6000$ formula. The director brings him in the park (again) and asks him to start running (again). At this moment the young man sees an horrible, crumpled and obese old man, carrying a placard "If I catch you, I fµck you".