I always say "excuse me" when passing someone in a narrow space. And, for the record, I always thank someone when they hold a door for me. It's always good to be polite
(I know I sound like a priss, but I just got my kids to bed so I'm still in mommy mode)
By the way, Dionysus: The answer to your signature question is "no"
Also, is Missourah the right pronunciation or is it Missouree? Or is that one of those questions that divides families???