Two crabs were sunbathing on the beach. The girl crab suggested that the boy crab go get them ice cream cones from the vendor near the boardwalk. Mr. Crab bought two cones and made his way back to the beach, eating his ice cream along the way. By the time he had finished his ice cream, he realized that his girlfriend's had started to melt all down his claw, so he licked it up and ended up eating hers too.
When he arrived back at the beach Ms. Crab exclaimed "Where's the ice cream?"
"Well", he said. "I decided to eat mine, and then yours melted so I ate that too."
She was incensed and cried "You shellfish bastard!!"