Sheen was dropped after a public fall-out with show creator Chuck Lorre in 2011 and spent months hosting an irreverent online radio show and hitting the road for an ill-advised comedy tour, and Cryer still thinks the whole idea was a terrible one.

He tells The Hollywood Reporter, "I knew that Charlie, while being a gifted actor and a remarkably smart man, didn't have the slightest f**king idea how to put on a live stage show, even when he wasn't loaded, but I figured he must have at least one person in his retinue of managers and hangers-on who knew what they were doing.

"Turns out I was wrong. His first few dates resembled exactly what happens when a bunch of a**holes throw money at a drug addict to make him dance like a monkey."