Drama often happens when someone wins a roll and hands it over to a significant other, against stated loot rules. Have you ever done that? Is it just a token of affection? Or was there a threat of personal repercussions if the transfer wasn't made?
Have you ever let a PUG or someone of lower rank in the guild roll on an item and then made up a rule on the fly if you don't like the outcome? Have you made a loot decision based solely on how much or little you liked the player? Have you rolled need on something you didn't need specifically to grief your group? Have you ever ninjaed an item and then quit the group?