"The Mule" joke

On Monday Fred, an old country farmer, bought a mule from Luke, another old farmer, for $100. Luke promised to deliver the mule the next day.
On Tuesday Luke drove up and said, "Sorry, Fred, but I have some bad news. The mule died."
Fred: Well, then, just give me my money back.
Luke: Can't do that. I went and spent it already.
Fred: Well, OK then. Just unload the mule.
Luke: What ya gonna do with a dead mule?
Fred: I'm going to raffle him off.
Luke: You can't raffle off a dead mule!
Fred: Sure I can. I just won't tell anybody he's dead.
Several days later the two farmers meet up.
Luke: Whatever happened with that dead mule?
Fred: I raffled him off just like I said I would. Sold 500 tickets at $2 each!
Luke: Didn't anyone complain?
Fred: Just the guy who won. So I gave him his two dollars back.