Almost wrecked on the way home yesterday. Was approaching a red light at a very busy street on a steep downhill. The light is normally pretty short there so I was approaching it slowly hoping for the green and then began to move to a track stand to wait it out. No sooner did I turn my wheel to a sharp right did the light turn green. I started to turn the wheel back forward and pedal when my toe caught the end of my front wheel's fender. The fender folded under itself as it touched the moving tire and wedged itself between the tire and the rest of the fender instantly stopping me. I just barely managed to get myself unclipped before falling over.
The worse part was that the traffic behind me had no clue why I had just stopped and dismounted my bike as the light turned green. Fortunately it didn't take me long to get the bike to the sidewalk which at least indicated to folks that there was something wrong.
Took some tugging but I got the fender back out and nothing appears to be damaged.
Very strange sensation to start to pedal forward and then just have your front wheel stop moving for seemingly no reason. I'm really happy that I didn't fall over!