It happens. It's bound to happen.

After all, in any physical activity involving twisting and stretching, your digestive system is bound to be ... stimulated.

It's one of the dirty little secrets of yoga. In a number of yoga and pilates classes I've taken, someone has ended up accidentally ... farting.

It's especially disconcerting when it happens because everyone is concentrating so hard as they are focusing on their poses, and the class is quiet.

I was in a pilates class once when we were all lying on our backs with our legs curled up and our arms stretched out to do crunches, and the teacher was yelling at us to "Push! Push!" Suddenly, I heard a frrrrrrrrt, and some girl went running out of the class. I was concentrating so hard, it took me a while to realize what happened. I was thinking "what the..."?

That's why it's best not to eat or drink too close to going to a class. Unfortunately, it's not always easy to do so when you're in a rush.

Here's one that was caught during a taping of a show:

I don't know how Johnny Knoxville managed to get so much gas, but he made a prank about it at a yoga class for Jackass:

This one's just plain silly:

This next one is not for the queasy.

Do you have any stories to share? If so, post them below.