This was told to me in the pub last night by my friend Andrew, a rather strange chap at the best of times.
So, this guy gets a job at the local zoo as a keeper. On his first day he is busy cleaning out the fish tank when one of the fishes bites him. He hits it with his shovel killing it stone dead. "What shall I do with the body?" he thinks, "I know, I’ll throw it into the lions cage, they’ll eat anything". Later he is cleaning out the chimpanzees when they start throwing nuts at him, he lashes out with his shovel and kills two of the chimanzees. Again he thinks "what shall I do with the bodies" and again "I’ll throw them in the lions cage, they’ll eat anything". Later still he’s cleaning out the African bees when they start stinging him. He lashes out with his shovel squashing the lot of them. He shovels the bodies into the lions cage thinking "lions will eat anything".
The next day a new lion arrives at the zoo. He introduces himself to the other lions and asks "is the food any good here?" One of the other lions say "yes, it’s not bad, yesterday we had fish, chimps and mushy bees".
Boom tish, eyethangyew!