Luckily, Robert Downey Jr. had the strength to overcome his struggles with addiction, which led to time behind bars. "All those years of snorting coke, and then I accidentally get involved in heroin after smoking crack for the first time," the actor revealed to Rolling Stone. "It finally tied my shoelaces together. Smoking dope and smoking coke, you are rendered defenseless. The only way out of that hopeful state is intervention." Whatever kind of "intervention" helped Robert kick his habit, he's proven to be a changed man.