Miguel Britos badly let Watford down against Brighton with a horrendous challenge on Anthony Knockaert.
The Hornets welcomed Chris Hughton's newly-promoted side to Vicarage Road hoping to continue their impressive start to the season.
Having been the hero a fortnight ago against Liverpool with an injury-time goal in the 3-3 draw, Britos will no doubt be given a stern talking-to from Marco Silva on this occasion.
The Premier League had already seen one red card this afternoon, with Raheem Sterling sent off for the manner in which he celebrated Manchester City's winning goal against Bournemouth.
However, there was absolutely nothing controversial about the decision to send the Uruguayan down the tunnel.
The campaign may still be in its infant stages, but this is going to be a contender for the worst challenge of the season come May.
Take a look:
There's no excuse for such a dangerous lunge, especially so early on. Before long, Britos was taking a hammering on social media for the terrible tackle just 24 minutes into the game.
Twitter was stunned
To make matters worse, this isn't exactly a first offence. In fact, since the start of last season, the 32-year-old has been sent off three times.
Gary Lineker described his latest error as "the most horrendous tackle".
Knockaert had been causing him all sorts of problems down the wing, and it ultimately ended in this moment of madness. Why would he go over the top like that in the first place, let alone right in front of the assistant referee?
It makes the imminent arrival of Kieran Gibbs from Arsenal all the more crucial for Silva, and rumours of the left-back's arrival had already put Britos' future in doubt.
Gibbs should soon be a Watford player after the Gunners accepted a bid of £7million.
What did you make of the challenge? Have your say in the comments.