My dad always says he's a master of disguise.

This joke expertly plays with our expectations, taking a common phrase and twisting its meaning for a laugh. When someone says their dad is a "master of disguise," your mind immediately pictures a secret agent or a theatrical performer, someone adept at changing their appearance to become unrecognizable. The humor mechanism here is a clever blend of wordplay and ironic absurdity. The punchline completely subverts that expectation, implying that the dad's "mastery" isn't about looking like someone else, but about being so good at disappearing that he's simply never around.

The concept of a "master of disguise" is a classic trope, often found in spy thrillers, detective stories, and even cartoons, where characters like James Bond or Carmen Sandiego effortlessly blend into any environment or adopt new identities. This joke takes that dramatic, almost fantastical idea and grounds it in a darkly humorous, relatable family dynamic. It cleverly uses exaggeration to poke fun at the idea of an absent parent, transforming what could be a somber topic into a lighthearted jab by taking the literal interpretation of "disguise" to an extreme conclusion.