The Rush Hour With JB & BillyTriple MBilly’s Knock Knock Joke Some kindergarten grade humour from Fat this afternoon! “Jim. Knock, knock…” KNOCK KNOCK JOKE: “Europe.” Follow @triplemrushhour to watch all of Billy’s jokes on Instagram. Catch the best bits of the Rush Hour on the LiSTNR app! Download it here. RELATED: Billy Fumbles Through His Halloween JokeRUSH HOUR BEST BITS: