Never personally witnessed that.
On a related topic, I think it was first grade on the bus to school when I sat down in my seat and two kids came over to me. One said to me, regarding the other, "Do you think you could beat him up." Perplexed by the question, I said I had no idea. In response to which the silent kid started in on me like a tornado. I got thoroughly trounced. He must have had some kind of training, and I had had zero. Of course the bus driver noticed nothing (shades of Sergeant Schultz). That was when my folks enrolled me into a local Judo school.
