Terrifying/horrifying

One thing I find scary: watching women apply makeup on public transportation.  When it comes to eye makeup my fear is that the woman will poke herself in the eye, and with any kind of makeup I fear some kind of contamination, whether in the air or by contact.  The scariest things in the world are microscopic and deadly and can be anywhere.  Perhaps a public bathroom is only very slightly less gross than public transportation, but at least the former option not mobile.