Some people have a hard time saying thank you, and some feel it was your duty to help them out.
I've run across both, and both suck in my oppinion.
That's messed up.
Have you noticed the one's you do hold the door open for that only about have of them even say thank you?
When that happens I say it for them. :-) Just to get the point accross.
One day I noticed a guy coming up to the door at the same time I was and I stopped and held the door for him.
Dick stops in the open doorway and start telling someone with him to "come on, let's go" and stood there waiting for the other person and never even aknowledged my presence.
Of course I just let go of the door and it hit him in the back.
He sure did notice I wasn't holding it any more though.