Yeah, I'm guilty of doing this. Once while at the beach with some friends we we're talking about South Park. I mentioned that Timmy was my favorite character and proceeded to do my best Timmy imitation, my friends looked uncomfortable and moved away from me. I turned around and there was this kid in a motorized wheelchair, he was looking at me all pissed off and before I could apologize he hollered "Asshole!" (it actually sounded like "Athhhoe") he then spun his wheelchair around and sped off.