Larry the Lobster and Sam Crab were some fantastic musicians on the disco circuit. They jammed for many years till one night, after a gig and a few beers, they stepped out of a club and were run down and killed by a Mack truck. Larry the Lobster goes to heaven and Sam Crab goes to hell.
One day Larry says to St. Peter, "I sure miss my old buddy Sam, I hear he has his own disco down there. Do you think I could go visit him and jam some, just one more time?" St. Peter says, "I think you can have a one time, one-evening pass to Hell to jam with Sam Crab."
Larry is elated and asks St. Peter for an instrument. "All we have in Heaven are harps," he says. Larry the Lobster shrugs and says, "That will just have to do!"
So Larry goes off to hell and has a fantastic time. He and Sam jam all night, just like the old days. When he comes back and sees St. Peter, he thanks him profusely for the pass. But St. Peter just looks at Larry funny and asks him, "Aren't you forgetting something?" Larry thinks for a second, then smacks his forehead and says ...
"I left my harp in Sam Crab's Disco."