This brash list of NOs and its saucy sibling read like they were bought at a novelty store, but they're official city DOT signs. "Trenchant, unvarnished, and a little intemperate", they date back to the days of, and sound like they came from the mouth of, Ed Koch (may he rest in peace in his ridiculous cemetery plot). They're the brainchildren of none other than Gridlock Sam*, who served as traffic commissioner under Mayor Koch.
* Mr. Schwartz supposedly also writes columns under the name "Gridlock Shmuel" for the Yiddish News Report. I can't find any direct evidence of this, but I'd love to believe it's true.