I started this new group a couple years back to play some Darwin's World and I invited a couple of my co-workers to play. About half an hour before the game was to start, one of the guys gave me a call and asked if it was OK if he brought a couple more players so we had a more complete group. I thought the guy was reasonably aware that I was looking for "normal" people. Unfortunately, as it turned out, he had no ability to distinguish between normal and obnoxiously f***ed in the head. I knew that it was not going to be a very enjoyable night when the three of them showed up eating Taco Bell. OK, not that big of a deal, but why couldn't they have downed them in the car on the way over rather than bringing that smelly stuff in?
So one of the guys he brought was some dude who clearly took this stuff way WAY too seriously. And even though he was in my game, which I was trying to get off the ground, he was always talking about his other character in another campaign, and how he was the boggest baddest barbarian who had this enormous sword (which he could wield because he had Monkey Grip) who always went around kicking his party member's asses when they made him mad. At one point during the game we got bogged down because he was misinterpreting a rule pretty badly and wouldn't agree that I had the authority to interpret rules as I saw fit, being the game master and all. He was in his twenties, but he acted like a very immature highschooler. Oh yeah, he also had his other character's name tattooed on his arm. Dude, that might be cool if you're Vin Diesel, but for you, it's just lame.
So the other person was the girlfriend of the guy I invited. She was one of these very outspoken experts on everything, despite having no education beyond highschool (I asked what her degree was in, very politely, the next time I saw him). We were running a Darwin's World game, starting them out in one of the vaults, as per one of the adventures posted to the website. It begins when the vault's main computer melts down and they're forced to leave. Before leaving, she made certain that they took time out of their escape to hit the toilet and take all of the feminine hygiene products in the bathroom. I suppose that's the first thing people would load their pack full up on rather than food or survival equipment.
Needless to say, I only wanted one of the guys to come back, for another game, but by I ended up just scrapping the whole thing so I didn't have to deal with it again.
I'm sooooo glad I have a group now composed of actual long-time friends.