5 players who got knocked out in training by teammates

Moody’s desire to impress on his return after injury in 2004 caused a flare-up with the then Tigers captain.

“It was my first session and I was extra keen, trying to do everything and hit everything,” Moody told The Sun.

“Tempers flared and ‘Johnno’ and I had a little coming together. He gave me a little dink and I gave him a little dink – but his hurt a lot more! It’s just typical training ground stuff. You need that friendly rivalry.”

Cipriani was baited by Lewsey for not putting enough effort in a tackling drill. Reports claim Cipriani then retaliated by telling Lewsey to "shut up or be shut up". Next thing the 20-year-old knew he was lying on his back staring up at the sky with a fat lip.

O'Connell lost his nerve with the Ulster second-row in the build-up to the 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.”

The Ireland legend, who would often involved in training ground scraps, would never be involved in another after he learned from this incident that a single punch could hurt someone badly.

When England's Austin Healy began poking fun at a swollen and bruised Ronan O'Gara during the 2001 Lions tour of Australia, a young Brian O'Driscoll snapped and beat the lard out of him.

Here is legendary hooker Keith Wood's version of events.

"Austin came in and he was being an unbelievable pain in the a**e. I mean beyond all belief. He was touching ROG's face and saying 'c'mom Rog, let's have a little boxing match.,, c'mon c'mon'.

"ROG just said 'p**s off, just leave me alone, get away from me' and then suddenly this little voice peeps in... 'I'll have a bit of that,' says Drico and they put on a pair of boxing gloves and Drico beat the living crap out of him.

In this amusing video, Leota and James Haskell recall the time they came to blows. Of course, the big prop triumphed.