Don't stand so close to me

Things that bother me.
The other day, I was standing in the line of a grocery store with a few things.. More like one thing, a birthday card. As I patiently waited for the customer in front of me to decide which Hershey bar to get, I noticed that the person behind me was BREATHING on the back of my neck. Literally. I could feel her breath.. and I could smell it. HOW AWFUL!!
Why don't people respect my personal space.. Do you have to be THIS close to me? ICK!
Having someone I don't know stand that close to be kinda irks me.. I mean really. I don't know you or your germs. Please Back UP! That's another thing I need to work on.