Ha,ha..that is classic!!!
I hope you and your ego haven't been hurt!!
I have done that before (several times) and I still get embarrassed thinking about it!
I was walking doing "rounds" with my boss (which was very good looking) and we rounded a corner (in a building I had never been in) and I ran right into another wall (there was a section of wall...I can't explain it, it was designed weird)...anyway, SMACK into the wall, and I fall back on the floor and almost took him down w/ me! I about DIED!!!