The storm 'threw a monkey wrench into' their plans for a picnic. [=the storm ruined their plans for a picnic]
After many years of disappointment, she finally 'got the monkey off her back' by winning the championship.
Our teacher warned us not to try any 'monkey business' while she was out of the room.
(..) I thought your head would be bigger. Goddamn. It look like a peanut. Let's get you sworn in. Shut up. Shut up. Sit your monkey ass down. Chill out. Shit. And the dust storms. And we runnin' out of French fries and burrito coverings. And the dust storms. And we runnin' (..)2006 Idiocracy