Luckily my player doesn't have any extreme phobias but there is still one thing that can make him quite uncomfortable: Heights. Standing near a ledge more than a few meters from the ground, near an open window in a high story building or even on a rooftop - those really aren't things that Philipp likes. The same is true for open air staircases, natural cliffs or viewing balconies. The open-air aspect seems to be an important part of it because things like glass floors or being high up in a skyscraper don't cause him any issues at all as long as doors and windows are closed. Philipp likes to argue that his fear is somewhat rational and that he is only really afraid in situations where there is at least somewhat of a risk of actually falling through an unfortunate stumble or an accidental (or intentional) bump from behind. Interestintly enough though, one thing that Philipp doesn't have any problems with at all is flying, a situation where it is impossible to actually fall through any fault of his own.