Recovering drug addict Robert Downey Jr was high throughout the shooting of the Jodie Foster film Home For the Holidays. The 41-year-old admits the drama about a dysfunctional family was a relaxed experience for him because he spent much of the shoot high on black tar heroin and working on "projects" in his trailer. He recalls, "If you came into my trailer when I wasn't working I might have been constructing a large eighth-scale model of the space shuttle and I had lots of projects going on in the room. That was the first time (I was high on the set)." The Chaplin actor admits he failed to respond to director Foster's concern but, looking back, he appreciates she went out of her way to help him. He tells US chat show INSIDE THE ACTORS STUDIO, "She said, 'I know what's going on and I think you know that I know what's going on. I'm not worried about you on this film because it's kind of, like, safe... I'm worried about what will happen if you think you can do this again.' "I was like, 'You're so right, thank you, love you. I'm making tuna melts, do you want a tuna melt?' (I was) completely oblivious to what she was indicating.'"