Charlie Sheen has insisted we was spurred on by anger, not drugs, during his public meltdown in 2011.
At the time, the 47-year-old actor called his Two and a Half Men co-star Jon Cryer a "troll", slammed the series' creator Chuck Lorre and coined a series of phrases including "Adonis DNA" and "warlock" and claimed he had tiger blood running through his veins.
He was fired from Two and a Half Men and responded by going on a poorly-received comedy tour around the US.
The star yesterday told talk show host David Letterman drugs were not to blame for his erratic behaviour.
"Not during the meltdown," he explained. "During the previous 30 years, sure."