The Devil told the lawyer,

"I have a proposition for you. You can win every case
you try, for the rest of your life. Your clients will
adore you, your colleagues will stand in awe of you,
and you will make embarrassing sums of money. All I
want in exchange is your soul, your wife's soul, your
children's souls, the souls of your parents,
grandparents, and parents in law, and the souls of
all your friends and law partners."

The lawyer thought about this for a moment, then asked,

"So, what's the catch?"