In a train compartment, there are 3 men and a ravishing young girl. The four passangers join in conversation, which very soon turns to the erotic.  
Then, the young girl proposes, "If each of you will give me $1, I will show you my legs." The men, charmed by this young girl, all pull a buck out of their wallet. And then the girl pulls up her dress a bit to show her legs.  

Then she says, "If each of you gentlemen will give me $10, I'll show you my thighs," and men being what they are, they all pull out a ten dollar bill. The girl pulls up her dress all the way to her undies.  

Conversation continues, and the men, a bit excited, have all taken off their coats. Then the young girl says, "If you will give me $100, I will show you where I was operated on for appendicitis." Naturally, all three fork over the money, and then the girl turns to the window and points to a hospital in the distance and says, "There!"