Leicester secured their first win of the season as they hammered Nottingham Forest to dump their local rivals on the bottom of the Premier League and pile the pressure on manager Steve Cooper.
James Maddison scored twice and created another for substitute Patson Daka, with Harvey Barnes curling home a superb effort as Brendan Rodgers' side recorded their biggest home win since December.
For Forest, this first top flight East Midlands derby since 1999 was a night to forget.
Cooper's side never recovered from conceding twice in as many minutes not long after striker Taiwo Awoniyi had struck a post when clean through on the home goal.
The Forest fans bellowed their support for Cooper as they sang songs of defiance with the game gone and their team slipping to a fifth straight defeat in a single season for the first time since January 2004.
However, after celebrating a long-awaited return to the Premier League after a 23-year absence, owner Evangelos Marinakis did not sanction the outlay on 23 summer signings in a belief Forest were about to go straight back down.
Cooper must hope his boss shows him more patience than former Huddersfield manager Carlos Corberan, who was sacked after 11 games at Marinakis' Greek club Olympiakos earlier this month.
Barnes later said: "It was so enjoyable. After last season the result [4-1 loss versus Forest in February] in the FA Cup it made it a little bit more special. A derby game, with the season we have had, we were desperate for that win.
"We've played some good football this year, scoring a lot but also conceding a lot. So the clean sheet tonight is probably as enjoyable as the goals.
"We spoke how important it would be to get a quick start. It was a derby game so it was going to be feisty. An early goal helps and gave us confidence for the rest of the game.
"That clean sheet was important in the end. We know we can keep the ball out of the net and we have the quality going forward to score goals.
"There have been a lot of mistakes. We are still playing some good football at times but also switching off, but the signs are there. It has been a long time coming and hopefully this is the start of a good run of results for us. Getting that first win will take a weight off everyone's shoulders."
