Charlie Sheen's final days on the set of Two and a Half Men were far from smooth, according to co-star Jon Cryer. As the eighth season of the show progressed, it became evident that Sheen's performance was declining. Cryer noticed that Sheen looked gaunt, pale, and occasionally sweaty. His timing and delivery of punchlines were also starting to suffer.

Cryer recalled an incident during rehearsals where Sheen asked if he could simply stand next to a couch throughout a scene because he couldn't remember his lines. It was clear that things were not going well for Sheen, both on and off-camera.

The situation came to a head during a meeting with the showrunners in January of 2011. Sheen became increasingly agitated and agitated backstage, even talking to himself. Cryer and the rest of the crew tried their best to calm him down, but it was clear that Sheen was spiraling out of control.

During the final shoot of the season, Sheen struggled to remember his lines and had to take a few minutes to regroup. After delivering the lines perfectly, he promptly left the set without so much as a goodbye. It was evident to everyone that Sheen couldn't be counted on anymore.

There was an opportunity for Sheen to return for the finale, but both sides were unable to come to an agreement on a creative decision. Sheen had an idea for an emotional reunion with Cryer, but the showrunners wanted to have him deliver a rant about drug abuse before dropping a piano on him. Sheen didn't find this funny, and the finale was ultimately disappointing.