I had mine on my bike for 10 min when it happened, I was practicing clipping my left foot in and out while keeping my right foot free. I then clipped in both and while tootling around my front yard suddenly realized my cleat on the right foot was too loose to unclip from the pedal. After I fell over, I quickly looked around to see if any of my neighbors had seen. Luckily no one was outside but I was still fearful that a you tube video would soon be out titled "Doofus falls off bike" LOL. But glad to say once the cleat was tightened that I havent fallen since. :-)