There's usually always someone upset at a referee, whether it be a coach, player, fan, or person in a team's organization, but for the most part, people upset at an official don't take things too far.
Ivan Savvidis, the owner of PAOK (a soccer team from the Greek Super League), is one of those people that may have taken things a little too far.
After a disallowed goal in the 89th minute of a huge game between PAOK Salonika and AEK Athens, Ivan stormed the field with a gun on his hip, which caused the game to be stopped.
The entire league was suspended indefinitely following the incident that occurred.
In order to better understand what happened, though, check out this thread which details the events leading up to the owner of PAOK invading the pitch with a gun.
Soccer is an absolutely insane sport and this thread reveals how insane it can be (extremely insane).
That said, there's absolutely no reason to bring a gun onto the pitch to confront an official and now the league is suffering the consequences because of Ivan's actions.