Imagine Not Having Hair

Okay, so basically, the person is imagining what it would be like to be bald. And the kids are like, "Oh, you mean like when you're getting chemo?" And then the person gets all mad and says, "Bitch the fuck." The joke is funny because you, dummy, would not expect the person to get so angry when the kids bring up chemo. You're probably getting chemo in the brain, my guy.