Things that aren't wrong or weird but just wind you up.
People who do more than one sneeze at a time. My friend can never do one sneeze, has to do five and says bless you inbetween every one.
People who serve cold apple pie.
People who wear body warmers with short sleeve tops.
When you are talking to someone and they start checking out what your wearing and don't think you can notice they have dropped eye contact.