Yesh. Even I have my limits as far as foot etiquette goes.

"Happy New Year. Well, 2004 ended in a way that I could not have possibly imagined. I had a show on New Years Eve and during the show some guy sitting in the front row started picking his toes during my set. I'm not kidding. Shoe off, foot in lap, picking between his toes like a leprechaun snuck in there and left a pot of gold.It was so bad he may as well have been wearing a miner's hat so he see what he was digging for. And this wasn't some spring chicken. No no no, this was a man in his late 50's who wears a tie to work everyday. Where I was raised we were taught to not pick our toes in public. No picking anytime, anyway I noticed this "event" mid-sentence and was so shocked that I blurted out "Are you picking you fucking toes?" and everyone at the show stood up to look, which was followed by a groan of disgust. In what other profession would you have your work day interrupted by some fuck nut picking his toes? I love comedy." 

-From comic Tim Kaelin’s blog, published on January 5th, 2005.