Burton Albion stunned Leicester City at the King Power Stadium, as the former Premier League champions were booed off after being beaten 2-1 by Gary Bowyer's side.
Matthew Dennis and Kgaogelo Chauke ensured Leicester's woeful start was punished before Russell Martin's men, who then saw Oliver Skipp receive a straight red card, finally showed some fight.
Only five minutes had passed when a move involving the excellent Charlie Webster ended with Kyran Lofthouse slipping the ball through to Dennis before he fired past Alex McCarthy. City fans were in uproar 20 minutes later after seeing Chauke react first when Lofthouse's shot was deflected into his path.
But when Skipp walked for a cynical foul on Curtis Tilt on the 29-minute mark, Wes Burn's first strike since joining from Ipswich - converting at the far post from Will Alves' cross - prevented the atmosphere from turning truly mutinous.
Harry Souttar headed over the bar and substitute Tommy Watson went close as City tried to mount a comeback.
Albion's defensive grit helped them overcome late pressure to claim a memorable victory.
Leicester boss Russell Martin:
"One team wanted it during the opening 25 minutes and were hungry. We weren't, definitely not hungry enough.
"After that, we were but we were down to 10 men with a nothing-to-lose mentality. We were dominant for periods after that, which isn't easy when you're down to 10. But it's hard at that point.
"We have to have some really honest conversations. I take responsibility as a manager, so if I haven't prepared them psychologically well enough, we must look at that.
"But fundamentals are fundamentals, regardless of how you play. Those don't change.
"We can't play the way we want to play without those fundamentals. And they just weren't there to begin with.
"We've already watched the goals back as a group and highlighted bits that we don't want to be us. We have to make sure that is our worst 25 minutes of the season."
