Yes, I have fallen in clipless pedals-as almost everyone has. Mine was at a stop sign, and I stopped, unfortunately, where it was sloped exactly opposite of the shoe that I had unclipped, so I fell towards the clipped in side, and fell over of course. I now ride platform pedals with traction pins (some refer to them as BMX style pedals). Not because of falling, but I never got comfortable with my foot being in the same position for an entire ride, and my heels have a natural tendency to point in, so I had to move the cleat position very far inward on the shoe(which moves the shoe further out from the cranks), in order to not be scraping my heels on the crankarms constantly. Just never got to where I felt comfortable with clipless.