throw a monkey wrench into the works

brass monkey

Very cold.

cheeky monkey

An impudent person, usually a child.

get one's monkey up

To make someone angry, annoyed or irritated.

grease monkey

A mechanic, often with the specific connotation of an automobile mechanic.

if it works, it works

if an action achieves its desired result, one should leave it at that; the outcome of an action is more important than the action itself

like butter on a bald monkey

Very smooth.

lock someone up and throw away the key

To lock someone up in prison indefinitely.

make a monkey out of

To cause a person, group, or action to appear foolish or inferior; to subject someone or something to ridicule.