Referee Nestor Guillen showed 36 brawling players and staff a red card in a junior league match in Paraguay.
In the match between Teniente Farina und Libertad Club players and reserves all stormed on the pitch after the referee gave to red cards, describes this newspaper. After the brawl the referee wrote on the match report he gave 36 red cards, which might be a world record.
Hernan Martinez, president of the home club, Teniente Farina, says: “Many of the players that were on the field and on the substitutes’ bench, everyone went on to the field to try to control their team mates and even the players from the other team.” You can find more reactions in this news article about the 36 red cards by Reuters. I’ve added the video below.