The human shoulder: a glorified butter churn.
Look down the MotoGP grid and you'll see two kinds of riders: those that have endured shoulder injuries and those that probably will at some point in their career. A quick off the top of the head list of past and present riders who have suffered a shoulder injury include Dani Pedrosa, Nick Hayden, Valentino Rossi, Andrea Dovizioso, Cal Crutchlow, Marco Melandri, Neil Hodgson, Eddie Lawson, Kevin Schwantz, Troy Bayliss, Sete Gibernau, Casey Stoner, Carl Fogarty, Colin Edwards, Nori Haga and Kenny Roberts Jr.
Four-time world champion Lawson raced for the world championship trying his best to avoid sneezing or coughing as each time he did so he risked popping his shoulder due to a damaged rotator cuff.