Step 17: Catch a Mouse With a Jar and a Nickel
Turn the jar upside down and prop it up on a nickel.
A penny isn't big enough and the mouse will knock the glass over before getting under it.
A nickel is the right coin to use.
Do this somewhere mice can get to.
A mouse will crawl into the glass and knock it down while jumping at the peanut butter.
http://www.instructables.com/id/Trap-a-Mouse-with-a-Jar-and-a-Coin.-Then-Chase-it-/ I've caught many mice this way].