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.
(..) He blasphemed. I'll tell the warden. You'll tell him with my baton up your ass! Let me out! What is your malfunction, you fat barrel of monkey spunk? Please! I ain't supposed to be here. Not me! I won't count to three. Not even to one. You shut up, (..)1994 The Shawshank Redemption