3. Scotland v England, 2018
Scotland recorded a famous 25-13 win over England when the match eventually got underway but the rivalry had boiled over even before kick-off.
As both sides exited the pitch from their warm-up session, players from both sides got involved in a scuffle at the entrance to the tunnel, with the BBC reporting that both Owen Farrell and Scotland captain John Barclay had been involved before the teams were separated.