Roy Keane once played a prank on one of his colleagues when he was Martin O'Neill's assistant with the Republic of Ireland.
Goalkeeping coach Seamus McDonagh ended up on the deck after Keane moved a ball towards him as he went to kick another one.
The Manchester United legend and another coach were left in fits of laughter as McDonagh scrambled quickly back to his feet.
Meanwhile, TV presenter Laura Woods described Keane as "warm" and "generous" after working with him earlier this week.
She said on talkSport: “The game in itself, Peterborough put up such a good fight in the first half and the quality wasn’t quite there for Man City.
“You know what City can do, but it wasn’t quite there.
“The highlight for me, though, was sitting next to Roy Keane. I’m obsessed, I just think he’s the best person.
“He was wonderful, wonderful, wonderful. I’ve worked with him once before in the Carabao Cup final last year and was a little bit scared of him because you are as you know his persona.”
Gabby Agbonlahor, who has been critical of Keane in the past, interrupted by saying: “Maybe you need to do a Man United game where they are losing!”
But Woods replied: “Maybe I’ve been lucky. With a pundit, all you can ask is they answer all your questions.
“During the game, I just sat next to him for a little bit to say ‘tell me what you think Peterborough are doing right, what more do you want from City?’
“He was so generous with his information and so warm, I just loved it. It was great.
“Joe Cole was good too… morning Joe!
“I’m always quite overwhelmed by Roy Keane.”
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