If you pull at babies too hard, they'll spew like a can of beer. I used to shake up my daughter and hand her to people I didn't like. "Hold her just a minute, would ya?"

Framed as a deliberately outrageous parenting anecdote, the line uses gross-out exaggeration (a baby “spew[ing] like a can of beer”) to convert the anxieties and messiness of caring for an infant into a comic weapon. The second beat—shaking up his daughter and handing her to people he dislikes—pushes the joke into the realm of taboo, relying on the audience’s awareness that such behavior would be unacceptable in real life. The humor comes from the contrast between the speaker’s casual, folksy delivery and the shock value of the image, a common stand-up technique for eliciting laughter through transgression while signaling it as hyperbole rather than confession.