3. Ryan Caldwell
O’Connell lost his nerve with the Ulster second-row in the build-up to the 2011 Rugby World Cup. The Munster legend threw a punch and he went down, unconscious with a tooth bursting his cheek. Caldwell swallowed a lot of blood and an ambulance had to rush him to the hospital. The team doctor later told O’Connell: “The story is, you nearly killed him.”
4. Stuart Hogg
On a chip and chase, down the left flank, Hogg ran straight into the raised elbow of the retreating Conor Murray. The collision left him dazed and with blood pouring from a gash above his right eye. Accidental but very much a K.O. The Scotland fullback received treatment on the pitch before being escorted off and replaced by Anthony Watson.