I was walking out of the store the other day and walked right into the glass pane! It was so clean, I didn't realize the door wasn't open! Talk about humiliating!
Oh no!  I remember doing something similar when I was younger.  There was a pool outside of our screen door.  I went to run and jump into the pool from in the house and smashed right through it!
Yeah, there was no "cool" way to play it off either.  I swallowed my pride and left as quickly as possible.
Gotta roll with it!  Just play it off at that point.