We are about to start a campaign that involves high level characters that are supposed to have known each other for a while and work together. The DM has asked us to submit character histories for our characters and one of our fellow players has done something I consider to be a big faux pas.
Her character is introduced to the group by capturing them in a trap (physical) and making them beg for their lives, freedom and food.
At the time the rest of the group was powerful enough to defeat the dragon that devastated her town but yet we had to beg for our release from her and she was the same level the other 6 players were.
Never were any of us so much as asked about this history, and taking that kind of tact towards the other players just isn't cool unless it's cool with them....