Oct. 22 (UPI) -- Michael J. Fox discussed what it was like juggling filming for Back to the Future and Family Ties in an interview that aired on The Late Show with Stephen Colbert Tuesday . "You were playing Alex P. Keaton by day on Family Ties -- full day of shooting on one soundstage and then Back to the Future at night," Colbert said. "The teamsters come pick me up, throw me in the shower, get me a cup of coffee," Fox recalled. He said he'd have his coffee in the shower working on Family