Preston North End manager Simon Grayson was embarrassed by strikers Eoin Doyle and Jermaine Beckford after the pair were sent off for fighting one another.
Doyle and Beckford came to blows after the Irishman failed to play Beckford in as North End looked for an equaliser in the last minute of their 2-1 loss at Sheffield Wednesday.
"You expect it in the playground between four or five-year-olds, not from two professionals who've been in the game a long time," the Preston boss told BBC Radio Lancashire.
"They've let themselves down, but that's the least of it. They've let our supporters down who've travelled here, and ultimately cost us the potential of getting a point or maybe three points because 11 against 10 we were on top and we had them.
"For something like that to happen is embarrassing. It's a joke, it's a disgrace."