Basically, a lot of things
  1. Driving at night
  2. Driving when it's raining
  3. Driving when it's snowing
  4. Driving
  5. Asking where the restroom is in an unfamiliar place
  6. Getting up to use the restroom in front of a crowd
  7. Being in a place with no restroom
  8. Making plans to hang out with friends
  9. Hanging out with people I hate or am really intimidated by
  10. Being around people with loud voices
  11. Being in a large crowd
  12. Making eye contact with people I don't know