This guy and his coach are quite the sore losers:

A Cuban taekwondo athlete and his coach were banned for life after Angel Matos kicked the referee in the face following his bronze-medal match disqualification.

Cuban coach Leudis Gonzalez offered no apology for Matos’ actions during the men’s over-80 kg (176 pounds) match.

Matos was winning 3-2, with 1:02 in the second round, when he fell to the mat after being hit by his opponent, Kazakhstan’s Arman Chilmanov. He was sitting there, awaiting medical attention, when he was disqualified for taking too much injury time. Fighters get one minute, and Matos was disqualified when his time ran out.

Matos angrily questioned the call, pushed a judge, then pushed and kicked referee Chakir Chelbat of Sweden. Matos then spat on the floor and was escorted out.

“He was too strict,” Gonzalez said, referring to the decision to disqualify Matos. Afterward, he charged the match was fixed, accusing the Kazakhs of offering him money.  [CNN.SI]

I saw this guy compete against the Korean Taekwondo competitor Cha Dong-min in the semi-finals where he seemed to give Cha a lot of cheap shots and seemed pretty angry that he lost.  Cha would eventually go on to win the Gold Medal.  Matos and his coach on the other hand have been banned from the Olympics for life which is a well deserved punishment.