Just now catching up on this thread, so I'll put in my two cents. Frankly, I find it very intersting.
Rex, sorry no one acknowledges you openings doors and stuff. Usually when I'm on campus, someone opened the door to the Union for me. I always give a faint smile and a nod (I might add I always open the door for old ladies...it's corny but oh well). I do admit that for some reason it was only recently that I acknowledge men opening car doors for me. I ocassional jump out the car before realizing the guy is on his way to open the door for me. I blame it on being raised in a 'mile-a-minute' family. If your not out of the car in .0000569 of a second, you'll be locked outside of the house with the dog.
"You're either lying or stupid." "I'm stupid! I'm stupid!" Megatron and Starscream