Friends and celeb peers fire up a roast of comedy team Cheech Marin and Tommy Chong. Brad Garrett hosts the event, which is slated to feature remarks by Tom Arnold; Geraldo Rivera; Penn and Teller; Wilmer Valderrama; Greg Giraldo; Steve Carell; Rev. Al Sharpton; Andy Dick; and Chong's wife, Shelby. Taped at Caesars Palace in Las Vegas.