What is the origin of the idiom "monkey in the middle" and when to use it?

The origin of the idiom "monkey in the middle" can be traced back to the game of catch or soccer, where players form a circle and try to keep the ball away from one participant positioned in the middle. Figuratively, it refers to a situation where someone is caught or trapped between two opposing forces or groups, often being used as a target or subject of teasing, manipulation, or exclusion.