Santiago Pulella was on the field just 12 minutes before he was shown a red card by during the World Rugby U20 Championship semi-final between Ireland and Argentina.
Ireland held a healthy 30-7 lead when the Argentina prop headbutted Ireland second row Sean O'Connor.
After an Argentina lineout in Irish territory, the South American side set up for a maul. Ten seconds after the incident, the referee called time off and went to the TMO.
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On commentary for Sky Sports, Shane Horgan had no doubt that it was a red card.
That's red. That's crazy. He could have broken a jaw there.
Here's the incident.
It was a game dominated by Ireland as they eventually won 37-7 to set up a final against either England or South Africa.
