For Championship clubs, football can often be a game of very narrow margins.
That makes refereeing mistakes all the more significant, especially for teams on a poor run.
Leeds United were winless in four league games going into their meeting with Sheffield Wednesday, and after going 2-0 down they thought they'd restored some hope when Liam Cooper turned home a free-kick.
https://twitter.com/FootballOn5/status/688409142919180289
But, despite initially awarding the goal, the referee then decided to rule it out... to let Wednesday make a substitution.
https://twitter.com/WALMOT3/status/688365420521349121
Naturally, it didn't go down too well.
Fans of the away side were incensed.
https://twitter.com/jacktimms92/status/688367124939730944
Really incensed.
https://twitter.com/TomFoy_/status/688367776369631233
Many were unsurprised.
https://twitter.com/awinehouse1/status/688363263252385792
There was some of the usual wisecracking.
https://twitter.com/EamoV1/status/688364870673285120
https://twitter.com/MrPaulRobinson/status/688366906798116864
But others took it in their stride.
https://twitter.com/lufc_dan/status/688363838127927297
