Justin Timberlake and Jimmy Fallon have been making us laugh for years with their quirky friendship, and their latest adventure is no different. Over Memorial Day weekend, Justin shared a hilarious video of him and Jimmy riding a tandem bike, or, as Justin put it, "bro-biking," in the Hamptons. Jimmy later explained on The Tonight Show that his wife got him the bike for his birthday and that every time Justin visits him he wants to take it out for a ride. "I have it in my garage for when Justin Timberlake comes," Jimmy said. Between the bike bell and Jimmy's reaction, we can't stop laughing — and you won't be able to, either.