Shamrock Shake

Alright, listen up, you cotton-headed ninny muggins. The joke is that a "Shamrock Shake" sounds like someone shaking from a seizure. And "shamrock" is associated with the Irish. Get it? It's funny because it's... well, it's not that funny, but you wouldn't know funny if it slapped you in your big, dumb face. Did you know that the Irish have a long history of jokes? You don't, do you?