Robert Downey Jr. - From 1996 through 2001, Downey was arrested numerous times on drug-related charges including cocaine, heroin and marijuana and went several times through drug treatment programs unsuccessfully, explaining in 1999 to a judge: "It's like I've got a shotgun in my mouth with my finger on the trigger, and I like the taste of the gun metal." He explained his relapses by claiming to have been addicted to drugs since the age of eight, due to the fact that his father, also an addict, had been giving them to him. In April 1996, Downey was arrested for possession of heroin, cocaine and an unloaded .357 Magnum handgun while he was speeding down Sunset Boulevard. A month later, while on parole, he trespassed into a neighbor's home while under the influence of a controlled substance and fell asleep in one of the beds.[He was sentenced to three years of probation and required to undergo compulsory drug testing. In 1997, he missed one of the court-ordered drug tests and had to spend six months in the Los Angeles County jail. (AP Photo/Nick Ut)