overyourhead

The World's Funniest Joke (so far)...
Starting back in September a science project headed by Dr. Richard Wiseman (University of Hertfordshire) in collaboration with the British Association for the Advancement of Science called LaughLab has been trying to find the world's funniest joke.

The current leader is:
Sherlock Holmes and Dr Watson are going camping. They pitch their tent under the stars and go to sleep. In the middle of the night Holmes wakes Watson up: "Watson, look up at the stars, and tell me what you deduce."
Watson: "I see millions of stars and even if a few of those have planets, it's quite likely there are some planets like Earth, and if there are a few planets like Earth out there, there might also be life."
Holmes: "Watson, you idiot, somebody's stolen our tent!"

Close second:
A couple of hunters are out in the woods when one of them falls to the ground. He doesn't seem to be breathing. The other whips out his mobile phone and calls the emergency services. He gasps out to the operator: "My friend is dead! What can I do?"
The operator, in a calm soothing voice says: "Just take it easy. First, let's make sure he's dead." There is silence, then a shot is heard. The guy's voice comes back on the line. He says: "OK, now what?"