People that have no feel for personal space.
Was sitting on the train today. Was the only one in this passenger car (Ha! New word learned
). A woman comes in and takes the place next to me although there are about 50 other empty places. Then she almost cuddles to my shoulder to get a look at my phone screen and doesn't get it when I try to shift myself away. It was so incredibly unpleasant/intrusive that I had to get-up and change the seats although it felt pretty rude.