So the world's funniest joke has been traced :

The joke runs as follows: Two hunters are out in the woods in New Jersey when one of them collapses. He doesn't seem to be breathing and his eyes are glazed.
The other guy whips out his phone and calls the emergency services. He gasps 'My friend is dead! What can I do?' The operator says: 'Calm down, I can help. First, let's make sure he's dead.' There is a silence, then a shot is heard. Back on the phone, the guy says 'OK, now what?'

Complete Story : http://www.telegraph.co.uk/news/main.jhtml?xml=/news/2006/06/09/njoke09.xml