Sal sells his donkey to Sam for $100.
A couple days later the donkey dies.
The Sam goes to the Sal and says, "that donkey you sold me died. I want my $100 back."
The Sal says, "I already spent the money."
The Sam says, "Okay, I'll keep the donkey, don't worry about it."
A few months later the two cross paths.
"What did you ever do with that dead donkey?" Sal asked.
Sam responded, "I sold it and made a big profit."
"How did you do that?" asked Sal.
"Well," said Sam, "I raffled it off at $2 a ticket and I sold 100 tickets."
Stunned Sal asked, "But the donkey was dead!"
Sam smiled, "Yeah, but I only had to tell that to one person."