I hate it when people sit next to me when there are other seats available not next to anyone. It triggers my PTSD especially if I get blocked in. UGH. I was in the library the other day and someone came up behind me and sat in the computer carrel right next to me even thought there were only like three people in the whole library. If they had gone over one more there would have been one between me and the other person in the unit. It left me totally triggered for the rest of the day. Plus I had to listen to the person typing which kept reminding me he was there.