Somebody posted that Jason Alexander [Seinfeld] studied JKD, but I know [from a Playboy Interview] that Alexander studies TKD and is supposed to pack a mean punch and kick for someone of his posture. According to Playboy [who mostly have their facts straight], Alexander is a black belt. One of the people I wouldn't want to mess with is Danny Trejo, the scarred and tattooed bartender in From Dusk till Dawn. Danny Trejo is a former convict [11 years in total] and excelled in [prison] boxing. He trained actors in boxing and fighting. Some nice quotes, courtesy of imdb: Personal quotes "It was the funniest thing I'd ever heard. I'd been in Soledad, San Quentin, Folson, Vacaville, Susanville, Sierra - and here's a guy asking 'Can you act like a convict?' I remember I said 'I'll give it a shot'" [of on-set competition between actors] "I've watched so many of those kinds of things turn bad, and the last thing you want to do is compete with somebody, 'cause he might be a sore loser." [On being promoted from a $50/day extra to a $350/day boxing coach:] "How bad do you want this kid beat up?" [After being told the actor might hit back:] "For $350 a day, give him a bat. I used to get beat up for free."