I was on a old steam train back in the 50's, and coming home on leave.
I decided to go for a cup of tea and a smoke in the restaurant car.
Corridor ights were poor and when I got to the internal carriage door to pass through into the next carriage, someone else was coming the other way.
I stepped aside as a gentleman should, and so did the other person, we did this about three times, before I said "For ****'s sake, I'll go first then!" and walked smack into the shiny wooden door.
I was losing my rag at my own reflection!