You know what they say... There are those of us who have crashed, and those who will crash.. It's kinda the same thing w/ pedals I think. We all fall at some point!
One day I clipped out, put my foot down and the next thing I know I'm on the ground w/ my bike on top of me?? And yes, I was also at a busy intersection. I still have NO idea how I did it, but my left foot stayed clipped in so it was fun trying to get up! And my chainring bit into my calf as well. I had some good bleeding going. YIKES! In fact I still have the pretty chainring scar to remind me. But the best part.. Once I got the bleeding to stop I finished my ride!