"When arriving near the sign up table, I removed my right foot from the toe clip and came to a stop. Right after my right foot touched the ground, I found myself falling to the left. Somehow as I was falling my right prosthetic leg went flying. I could hear a fellow racer Scott laughing his butt off. I looked up to see people staring in horror. I could not help but laugh after looking at their expressions.
Scott retrieved my leg, laughing the whole time. "

Heh, heh.. this happens a lot regardless of clips vs. clipless pedals on both bikes and motorcycles. You gotta lean a little towards the leg that's on the ground and put all your weight on it. Or else if have some weight left on the bike and push off it towards the side away from your leg, you're gonna fall over. I've seen a couple of broken-ankles from motorcycles falling on people the same way, can be real dangerous because as your leg gets caught and the bike rolls, it can whip your head over and into the ground really hard.

As for Scott laughing, he probably would've done the same thing if some other rider pulled the same manuveur whether or not their leg fell off. Something's just comical about being stuck in your pedals and flailing helplessly as you're falling over.. I did this once at a stop light and fell over onto the two girls I was riding with causing a domino effect. We laying on the ground and couldn't stop laughing for about 5-minutes. Although the drivers we were blocking probably didn't think it was as amusing...