A study group calling itself Laugh Lab tested over 40,000 jokes, and about 2 million people participated in the voting, and the results of the poll were that the following is the funniest joke in the world:
"A couple of New Jersey hunters are out in the woods when one of them falls to the ground. He doesn't seem to be breathing, his eyes are rolled back in his head. The other guy whips out his cell phone and calls the emergency services. He gasps to the operator: "My friend is dead! What can I do?" The operator, in a calm soothing voice says: "Just take it easy. I can help. First, let's make sure he's dead." There is a silence, then a shot is heard. The guy's voice comes back on the line. He says: "OK, now what?'"
Tough to follow an introduction like that, but it is pretty funny.