'Two and a Half Men' 5 Most Controversial Moments

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From left: Charlie Sheen, Angus T. Jones and Jon Cryer in 2003, when the series' first season averaged 15.3 million viewers.

The long-running CBS sitcom finally turns off the lights this week after 12 seasons, some bumpier than others.

Two and a Half Men has had an enduring run, but it hasn't always been smooth sailing.

The venerable CBS sitcom — which ranked for a number of seasons as TV's most-watched comedy, despite mixed reviews — is calling it quits Thursday after 12 seasons and more than its share of turbulence.

Here are five of the biggest controversies that have centered on the series over the years. 

Two words: Charlie. Sheen.

If you're looking to avoid controversy, you probably shouldn't hire Sheen (Charlie) in the first place. Indeed, the actor's fame helped draw viewers, but he also made waves. After numerous incidents from his personal life garnered negative attention, he entered rehab in January 2011. Following Sheen's negative comments about series creator Chuck Lorre, the actor's contract was terminated a month later, and he was replaced the following season by Ashton Kutcher (Walden).

Another lead actor exits

Apparently, one castmember biting the hand that feeds wasn't enough, with Angus T. Jones (Jake) later following suit. He slammed the show as "filth" in November 2012, begging viewers to stop watching. Jones did not return after the end of the 2012-2013 season, and in 2014, he said he had been a "paid hypocrite" by appearing on the series.

See more Saying Goodbye: TV Shows Ending During 2014-15 Season (Photos)

Criticism over bawdy content

The show has frequently earned the ire of the Parents Television Council, with the watchdog group in particular flagging a 2007 episode that included jokes about bestiality and sex with vegetables. In addition, a Christian organization took umbrage with a 2006 episode that changed the lyrics of "Joy to the World" to details about a character's sexual proclivity.

Casting drama

The initial mixture of Sheen and Jon Cryer (Alan) proved to be a winning one for fans, but the combo almost wasn't meant to be. In 2014, Cryer admitted that CBS chief Leslie Moonves didn't want the pair for the show, worrying that they would bring "a little too much '80s-movie baggage."

Gay marriage plot

The series introduced a gay-marriage storyline in its final season, with Walden proposing to Alan in order to adopt a child. Some fans complained about the twist, and GLAAD president Kate Ellis expressed her hope that the show would properly convey that same-sex couples endure difficulty in some parts of the country when trying to adopt. 

Email: Ryan.Gajewski@pgmedia.org
Twitter: @_RyanGajewski