I've had a few.

Once when I was younger I almost got stuck under the garage door. I thought it was an automatic one that detected someone and jumped right back up, but it wasn't. Luckily my friend's sister opened the door before I was seriously hurt. I was somewhat caught under it for a second.

Then I had one when driving, the stop sign was hard to detect, so I yelled STOP and a semi drove by. Heh.