The movie he rented was about a 'maniac' [='madman', 'lunatic'] who goes on a murderous rampage.
She drives 'like a maniac'. [=she drives in a very reckless and dangerous way]
He's a complete 'maniac' when he's playing football.
(..) no one will be surprised. What about Mike? Mike can have his suspicions, but that's all they'll be. Please, one homicidal maniac at a time. I don't know when I'm gonna see Gus again... I mean, if ever. Keep it with you. When you have the opportunity, (..)2011 TvShow: Breaking Bad Title: Problem Dog Season: 4 Episode 7
(..) You know what? He's doing better. Really? Yeah. Uh... lately his mood's improved, and he's like a maniac with his P.T. - That's fantastic. - Yeah, don't get me wrong. He's got a long way to go, but he-- (..)2011 TvShow: Breaking Bad Title: Problem Dog Season: 4 Episode 7