Funny; I was just talking to my sister yesterday about how I've never fallen with my clipless pedals...
I was on the last part of my 6.5 mile commute today, when I pulled up to a line of cars waiting for a light at a busy intersection. The old fart (

) in front of me was too far right for me to squeeze past, so I decided to chill in line and wait for the green light. I noticed a handicapped tag hanging from his rearview mirror.
Just then, he noticed me in his rearview mirror and pulled left a little bit so I could pass. I clipped in and began to pedal, but I quickly realized that I wasn't going fast enough to get started. Before I knew it, I was on the ground.
I was very close to the curb, so I was able to stick my hand out to break my fall, and my bike frame never touched the ground. My ego, however, was damaged. I finally unclipped, stood up, turned around, and waved to the lady behind me to let her know I was okay. After she saw me wave, her look of concern turned into a chuckle.
Oh, and some guy in a pickup truck drifted into the bike lane early in my commute.

I yelled "HEY!" and when I got close enough, I told him, "Watch the BIKE LANE!" I think he got the message.
I've decided on a new mantra to say in my head whenever I approach an intersection (see my signature for details).