My date asked me if I knew how to cook.

This joke tickles our funny bone through a delightful blend of absurdity and self-deprecating humor. The punchline, "I only know how to burn water," creates a vivid and impossible image. Water, by its very nature, extinguishes fire, so the idea of "burning" it is a comical exaggeration of culinary ineptitude. It takes a common struggle – being bad at cooking – and pushes it to an illogical extreme, making the listener chuckle at the sheer impossibility and the speaker's dramatic lack of skill.

The humor also taps into a relatable real-world context: the subtle pressures and expectations that can arise in early dating. Cooking ability is often viewed as a desirable trait, suggesting competence and perhaps a nurturing side. The date likely expected an answer ranging from "yes, a little" to "I'm a gourmet chef." Instead, the speaker delivers a hilarious subversion of expectations by admitting to a skill level so low it defies the laws of physics. It's a playful way to acknowledge a common domestic failing while still being charmingly honest.