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 Rips Out Two Ordinary Monday JokesRUSH HOUR BEST BITS: