I've had a couple of buggers like that one over the years (not that extreme though, mind you), and the best solution is always the one magikot suggested: throw the fuckers out.
A few sessions I've had occurred where some horsing around was expected in the game. After we cleared a room of soldiers, my friend's character put my character into a bird cage (he had succeeded with a grapple check, being a fighter and all). I rolled a 17 to get out and I managed to make it with my dexterity bonus (I always play monks). As long as it only went on as an end of a mission gag or acceptable funny solutions to problems, it was cool. I've never had someone just do constant backwards humor in a game...no, I remember one guy who committed necrophilia with an old woman's body, and it was in the same damn game! Dammit I blacked that memory out for a reason.
Have you played the 4e monk at all, Sponge? Now that they're a psionic class I haven't given them a try. Well that and I always play a bard anyways...
A whole new level of nerd, I'm afraid I can't join in this. I'd probably end up penetrating the dragon too anyway.
The players in my Sunday session have a pet chicken named Drinky. They spent 300 gold raising it from the dead after the local guards caught the Warlock cheating at cock fights with it. Now it follows them from encounter to encounter, hanging back while they fight off cultists. We're playing Keep on the Shadowfell.
Monks are psionic now? That's great! Too bad I'm done with table-top gaming anymore, but if I happen to get back into it, I know what class to choose.
Oooh, Keep on the Shadowfell. We finished that one with a group of three, even if we had to nerf some of the encounters a little bit.
I've never ran any of the pregenerated adventures that Wizards put out. I've always made my own. Anyone ever play Paranoia? Best game ever!
Just played the Castle Ravenloft board game. An amazing D&D based board game and a good way to introduce people to 4th edition. Took the 3 of us about 2 hrs to go through the scenario we played.