Check out John Cho popping in the trailer for the indie comedy Saint John of Las Vegas, starring Steve Buscemi. It's brief -- blink and you'll miss him. Didn't spot him? That's because he's completely masked and suited up... and on fire.
I'm fairly certain that's not really John under there -- at least for the fire part -- but that's unmistakably his voice, playing a "carnival human torch." Okay, sure. The movie doesn't look all that great, and gets double minus points for Sarah Silverman, but there you go.