White line fever can get to the best of us.
However, fans don't usually tend to act on it.
That wasn't the case for one particular Birmingham City fan, who ran on the field during an English Championship game and absolutely clocked Aston Villa's Jack Grealish.
The fan was then quickly escorted away and arrested.
Grealish got the last laugh, though - scoring the winner for Villa in the derby against Birmingham City. Villa won 1-0.
After the game, Birmingham City issued a statement:
“Birmingham City Football Club would like to apologise to Jack Grealish and Aston Villa Football Club for an incident in this afternoon’s derby match.
“We deplore the behaviour of the individual who committed this act and rest assured he will be banned from St. Andrew’s for life. The Club will also support any further punishment this individual may face in the eyes of the law.
“The Club will be working with the relevant authorities to investigate all the circumstances and we will be reviewing our stadium safety procedures.
“What happened has no place in football or society. Jack is a Birmingham lad and regardless of club allegiance should not have been subjected to this – there are no excuses.
“Again, we apologise to Jack and all at Aston Villa Football Club.”