In Watch It, Peter Gallagher plays a drifter who comes back to Chicago and moves in with his cousin (Jon Tenney) in an attempt to make amends. Soon, the cousins have patched things up, and the duo become involved in a series of complicated practical jokes with Tenney's housemates. Things turn sour when Gallagher falls in love with his cousin's girlfriend (Suzy Amis), and one of the cousins is forced to grow up and make a commitment to an adult relationship.
~ Stephen Thomas Erlewine, All Movie Guide