In his new comedy All Square, Michael Kelly plays a bookie who befriends a former high school classmate’s son and starts taking bets on his little league games. At the SXSW premiere of the film, we spoke with Kelly and his co-stars—Tom Everett Scott, Isiah Whitlock Jr., and Yeardley Smith—about working with youngters, and to see if they’d ever gamble on kids’ sports.