We're used to players surrounding the referee if they're unhappy with a decision but this takes the biscuit.
The goalkeeping coach for Penarol, a small club team in Brazil, punched a referee in the back of the head after they conceded a goal in their match against a club called Fast Cube.
I'm not entirely sure why they have such a gripe with the decision but the behaviour of coach Guanair Conceição was ridiculous[Watch Video]
Apparently, Vladimir Bastos, a Brazilian league official, described Conceição as 'an unbalanced person.' You can say that again.
hat-tip: Dirty Tackle