+1

I actually went through a plate glass window at an LBS years (decades?) ago when I got my feet stuck in my straps, and couldn't get out. My balance was off, and instead of leaning on the concrete pillar on my right, I tipped over to the left and went through the window. No injuries (aside from my pride), but it could have been really bad. There were long shards (2 ft) of glass hanging down from the top of the frame like stalactites. If any of them had come down before I got up out of the display case, it would have been ugly. That was with toe clips and straps though.

I've been wearing clipless for over 10 years now since that episode, and still manage to go down about once a year or so. Usually in the spring when I first get back on the bike, or the odd time when I get surprised into an emergency stop. After a while it becomes second nature - I instinctively unclip my right foot now whenever I see that I'm going to have to slow for traffic in front. I can still trackstand with one foot unclipped, and clip back in once traffic begins to move again.

Reducing the tension helps, as does using a multi-release pedal (as others have said).

Good luck - and wear your angry squirrel scar with pride!