I've been using clipless pedals for about two years now and I still fell over last night. I was riding in a pack and the riders in front of me slowed suddenly to avoid a road hazard. Usually, this group is good about calling out if they are slowing or stopping like that but it was near the end of the ride and I think the focus had relaxed some. I realized I was gaining ground on the wheel in front of me so I slowed up and tried to clip out in case they were stopping instead of slowing. Well, my foot didn't clip out. My cleats had gotten some mud in them over the weekend and I'm guessing I didn't clean them as well as I should have and that's why it got stuck. I yanked a little harder with my foot and got it to unclip but in doing so, I lost my balance and went over... in front of about 30 people. I was more embarrassed than hurt and scrambled back on my bike quickly to continue the ride. You almost hope that if you jump back on the bike fast enough, no one will notice that you fell. Of course, everyone did notice but they were nice about it. The reaction of most of the riders was been there, done that or it happens to the best of us.