Yes, these things happen. Fortunately not too often as to make us stop watching soccer games.
During a match between De Treffers and NEC in the Dutch Cup of the 2000/2001 football season, a true fan thought about not letting his favorite team down. Funny thing is he actually tried to play by the rules, and used his head instead of his hands.
Don’t you just love it when fans mess up the game? Oh, and if you’re wondering, NEC still won the match with 2-1!