Charlie Sheen
It's difficult to sum up all Charlie's troubles in a paragraph, so here's the short version: after US network suspended production on Two and a Half Men's eighth season in February 2011, Charlie went nutso: ranting against the show's co-creator Chuck Lorre, hooking up with porn star "goddesses" and coining catchphrases like "Winning!" and "tiger blood". Warner Bros TV eventually got sick of his antics and fired him. What a bunch of trolls!