On the way out of a convenience store recently I (out of habit) held the door for a gal about 8 steps away on her way in.
She stopped dead in her tracks and looked at me like she was ready to hit me with pepper spray.
I let the door go, shook my head, and headed to my truck, and she then walked on in. I looked in my mirror to see if I had a booger hanging out of my nose or something.... Nope, handsome as ever.
That bugged me all day. Screw people!