I did forget to mention the regular disputes over whether or not another player is "in character".
"You can't steal that Ring of Protection! Lawful neutral would NEVER do that!"
"I'm making an exception because my AC is too low for my level!"
"You can't DO THAT! Lawful neutral supports order, and stealing is against order!"
"Lawful evil can steal!"
"Yeah, but they steal for a reason, like an evil agenda!"
"Well, I have a neutral agenda: to increase my AC!"
"You're cheating! That would give your Priest of Lathander a higher AC than my Barbarian, which is stupid!"
"Yeah, well, this is a game, and the rules are guidelines, not rules!"
"Rules are rules, you retard!"
"Yeah, and alignment is a guideline, dork!"
(repeat for 30 minutes while the passive-aggressive DM makes audible sighs and/or watches Evangelion on a nearby TV)