What has three letters and starts with gas?

The joke “What has three letters and starts with gas? A Car” is a play on words that cleverly subverts the listener’s expectations. The setup, “What has three letters and starts with gas?”, prompts listeners to think of a three-letter word that begins with the word “gas.” This leads the audience down a path of trying to decipher a word that fits this description. However, the punchline, “A Car,” delivers an unexpected twist. Instead of focusing on the word’s spelling, the joke refers to the function of a car, which starts or operates using gasoline (or “gas”).