A lawyer is working late one night. There's a knock on his door, and in walks Satan...

Satan walks in, takes a seat, and starts talking.

"I'm here to make you an offer. I will give you all the fame, success, power, and wealth that you've ever desired. You'll be the top of your field; you can even get into politics, if you want. Schools will adopt your name. Want to own an island? How about three islands? All of that, and more...
"...and the only thing I ask for in exchange is a promise from you. You promise that your soul, the soul of your wife, and the souls of your children will be mine for all eternity."

The lawyer says nothing. He stands up, scratches his chin, and wanders around the office for a few minutes, thinking. Finally he turns to Satan and says incredulously, "All right, all right, wait just a second here. What's the catch?"