Jack Wilshere was on the receiving end of a very sore one indeed on Monday night as the Arsenal midfielder felt the full force of Jobi McAnuff's boot in his nether regions.
The Reading midfielder earned a yellow card while Wilshere was left with red private parts, but the 20-year-old was thankfully able to continue after providing his member with a bit of TLC.
It was not the first time this week that a player has taken a blow that left spectators wincing, with Dejan Lovren taking a foot to the head from Zlatan Ibrahimovic when Lyon met Paris Saint-Germain.
These two painful instances got GMF thinking about some other challenges that make us shudder every time we watch them. Our five choices are below - but please comment with any others that make your eyes water.
Didier Zokora v Emre Belözoğlu
Trabzonspor v Fenerbahçe
In April of this year, Emre was banned by the Turkish FA after being found guilty of using racially insulting language towards Didier Zokora in an encounter between Trabzonspor and Fenerbahçe.
The Turkey international was, however, suspended for only two matches and, deciding that the punishment did not fit the crime, Zokora exacted retribution on the crown jewels of Emre when the two clubs met a month later.
Abou Diaby v John Terry
Arsenal v Chelsea
John Terry will put his head on almost anything in pursuit of a goal or to defend his own, as this clash with Arsenal's Abou Diaby in the League Cup final proved.
With the ball bouncing around in the Arsenal penalty area, Terry launched himself towards it but his face was met only with the boot of Diaby, who knocked the Chelsea captain out cold.
Mario Balotelli v Scott Parker
Manchester City v Tottenham
Like Chelsea skipper John Terry, all-action Tottenham hero Scott Parker is willing to put his safety on the line when required, and was left with a sliced forehead after this collision with Mario Balotelli.
The Manchester City striker later received a retrospective suspension from the FA, after the referee failed to spot Balotelli deliberately tread on Parker's head.
Hugo Rodallega v Wayne Rooney
Manchester United v Fulham
How sharp must be Hugo Rodallega's studs? The Fulham striker left Wayne Rooney requiring dozens of stitches to his right thigh after their, albeit accidental, coming together.
Rooney was almost sliced down to the bone by Rodallega, and missed out on four weeks of Manchester United action.
Harald Schumacher v Patrick Battiston
West Germany v France
It's hard to decide which was worse - the state in which Harald Schumacher left the face of Patrick Battiston, or the fact the referee failed to even award a free-kick.
Battiston slipped into a coma after being clattered by Schumacher in the 1982 World Cup semi-final, while he also damaged a vertebrae and lost three teeth.