Ha! Even worse.......
I had one of my shop doors partially open a few weeks ago and drove the tractor in (in a hurry, starting to rain, not thinking, etc.). Heard a loud bang and saw that the ROP had hit the bottom of the door. Thank God it wasn't any lower or that would have been a total mess. It bent the bottom channel an inch or two but I was able to push it back out with the tractor. I'm guessing it caught the door by a fraction of an inch.
Edit: These are 12 x 14 commercial roll-up doors. When we bought the place they had them wired without the stop function (so all the way up or all the way down). Not sure why; maybe they only had 3 conductor wire and you need 4 conductor for the stop function. Me, in my infinite wisdom, rewired them so that the stop function works shortly before the tractor incident. Guess that was a relatively cheap lesson as the door is still fine; but that could have been so bad if the door had been any lower.