Have you, or anyone you know, hit a glass door hard, not realizing it was there?

When we lived in Wichita we took our glass storm door down to the front door for some reason. It was down for about 2 years and we got in the habit of just walking in the house if the main door was open.
Then I put it back up. It was just one long piece of glass.
My daughter was about 8 at the time and she came running in from outside. The main door was open and she’d forgotten about the glass, so she didn’t even slow down… WHAM!! before I could even move. She slid down that glass like Wiley Coyote! Scared the crap out of both of us, but she was unhurt.