I have plenty of funny D&D stories, but I'm afraid they're much less funny when you aren't part of the D&D group. The thing I find about jokes regarding the game, is that it generates so many in-jokes simply through play, that to tell someone outside your group about that story loses much of the humor. Not because what happened isn't really funny, but because the context in which it is funny is so extensive.
I suppose I shouldn't just come in and not drop off any anecdotes, though. That would be rather obnoxious. Allow me to tell you the tale the Chryling tradition:
I've been running the same campaign for nearly 3 years, now. 3 of the original players still play with us, and three have come and gone and we are currently sitting steady with our party of 5 for about a year now. We play a module of 3.X created by me which is meant to allow characters to build their characters without many class restrictions, is meant to give a more freeform playstyle to magic and is meant to make it far, far more difficult to advance your characters. While the game started out with only Humans as a playable race, I've slowly introduced 4 more races. A year or so ago, when I introduced two of those races (one of them, a small forest-dwelling species called Chrylings) we also acquired a new player, who decided to be the first to play a character from that race. The player was with the party on and off for a few months, over the course of which the Chryling was established as a little bit touched in the head. The player who played that Chryling left our group, and in another tradition of my campaign, his character was brutally murdered the session after the player left. At the same time, one of our current group members joined the campaign, choosing to play a Chryling as well. Now this player is particularly good at playing very slimy, untrustworthy characters, and this was one in that tradition. Since then it has become a very regular occurrence for his characters to die horrible deaths. After every death, he resolves that this next Chryling will the one that survives. Shortly after, it will die. Now because of the precedent set by the first Chryling in the party, and the slimy way of playing Chryling's our current player has, the rest of the party has now decided (partially RP and partially out of forgetfulness) that their characters can no longer discern which Chryling they are currently traveling with, oft times calling them the wrong name, be it out of forgetfulness, or because their character actually believes that they are still traveling with the same slimeball, lying Chryling that died a couple characters ago. The characters have died so frequently that I've actually had to come up with a canonical reason why the fates kill any Chryling that joins the party.
Note: I do not kill these characters purposefully, it is almost always an act of pure terrible luck, or blind stupidity on the players' part that kills them.