Take My Ex-Wife, Please

At work in my lab, a professor I didn’t know was demonstrating a technique where you insert 10 mL of air into a mouse’s back to simulate a certain type of injury. As the air was inserted, the mouse began to bulge and stretch ending with a grotesque bulge in the middle of its back. I looked at it and said , “Looks like my ex-wife.” He gives me a look for a second and then turns to my professor and says, “This boy should be put in shackles and in prison. He’s sick.” I thought that was a strong response to a bad joke until I realized he thought I said “Looks like my next wife.”