Battery vs. Wife

What's the difference between a battery and my wife? The battery has a positive side.

Explanation

Experiment

This is a classic 'wife bad' joke where the humor comes from the stereotype of a nagging or negative wife. The punchline plays on the double meaning of 'positive side,' referring to a battery's terminal and a person's personality. It's a bit of a dig at the wife, implying she's always negative.