I have a longer version of this one, but will print the short version to try to alleviate some of the agony.
Sam Clam and Ollie Oyster lived in the ocean. When they died, Ollie
went to heaven. But sinful Sam went to hell. Ollie missed his friend.
He asked St. Peter for a weekend pass to visit Sam. "OK," Peter said,
"but to be safe, you have to take your wings, robe and harp. Do not
forget to bring them back." Ollie agreed, and away he went. He spent
the weekend partying in a nightclub that Sam had opened. On Sunday
night, he returned to the pearly gates. Peter was there. "I see you
have your wings and robe, but where's the harp?" he asked. Mortified,
Sam sang, "I left my harp in Sam Clam's disco!"