Cacophobia: Crudely put, this is a phobia of ugliness. So if you see someone reacting weirdly to something that is unpleasant to look at, then they might be suffering from this phobia.
Cathisophobia/Thaasophobia: An exact opposite of basiphobia, this is a fear of, get this, sitting! Seriously? How on earth do they manage to live without sitting?