Sheffield Wednesday defender Matthew Penney dropped a massive clanger in what was a rare start for the Owls on Wednesday night.
The south Yorkshire outfit were defeated on their return to Championship action, also ending an unbeaten run of four league games.
Interim boss Neil Thompson faces a tough task as his side remain some six points from safety and in losing to Coventry City, gave a potential relegation rival some extra leg room at the bottom of the table.
On paper, it was probably one of the strongest line-ups the Owls caretaker could select with Keiren Westwood returning between the sticks, veteran midfielder Sam Hutchinson making his second debut with usual culprits Barry Bannan, Tom Lees and Adam Reach all starting too.
Plenty of stick was given to the Owls' former captain on social media, one member of the Hillsborough faithful went as far as wanting him gone from the club.
However, he was probably one of the only shining lights of the match, recording a squad-high 7.1 rating per SofaScore.
YorkshireLive's Dom Howson was particularly glowing about Lees in his post-match ratings, he said:
"Defensively solid. Strong in the air and made a number of important clearances. A no-nonsense performance."
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There were plenty of others far more culpable than the 30-year-old.
Indeed, Penney was one of those as he started only his third game of the campaign and first in a flat back-four. And in his poor display, he betrayed the faith given to him by his 57-year-old temporary boss.
The 22-year-old academy product was hugely wasteful, making only 59% of his 27 passes - the worst of any outfield starter from the visiting team, via SofaScore.
He was also careless with the ball, losing possession a whopping 22 times, which was second to central midfielder Barry Bannan but as the set-piece taker, his numbers are hugely unfavourable.
On top of that, Penney - who was shipped out on loan last season - also won only six of 14 duels (42.8%) both on the ground and in the air, and as a result, the opposition capitalised.
The left-back even recorded three fouls and picked up a booking before the 50th minute, just to cap off his nightmare display at St Andrew's Stadium.
Penney was far worse than Lees and plenty of his other Owls teammates on the night, so Thompson may want to think twice before selecting him again anytime soon.
AND in other news, Exclusive: Palmer drops Sheffield Wednesday manager claim