My fisrt fall was while trying to track-stand at an intersection I commute through every day. This was a pleasure ride with my wife and, as I learned this day, they change the timing of the lights during the normal commute hours. I wasn't expecting to have to stay stationary that long and ended up falling over into the #3 lane. Nothing hurt but my pride.
Second was on the same street but different intersection and, again, a pleasure ride with my wife. I came to a stop in the right lane in the right tire track and expected my wife to either stop behind me or pull to my left. She went to the right and was partially in the right turn lane with cars coming up behind her. I tried to move my bike to the left so she could get out of the turn lane with my left foot still clipped in. Down I went. Nothing hurt but my pride.
Older son decided to go for a ride with my wife and I. I let him ride the old Schwinn road bike I was using as a commuter and also loaned him a pair of clipless shoes (I and both my sons wear size 13). He did well till mile 5 when we all stopped and he forgot to click out. Nice, slow-motion fall. Nothing hurt but his pride.
Younger son recently picked up an old Centurion road bike off Craig's List. It came with clipless pedals and a pair of shoes that happened to fit him. I did a quick tune up and he took it out for a ride after practicing clicking in and out a few times. At the end of the test ride, he was heading straight toward me with a big smile on his face. He came to a nice graceful stop then got this confused look on his face as he fell over. Nothing hurt but his pride.
And then my wife....well, better not go there.