The pressure grew on Nottingham Forest manager Steve McClaren as his team were thrashed by fellow strugglers Burnley.
Jay Rodriguez's two close-range headers, on four and 14 minutes, put Burnley 2-0 ahead.
After poor Forest defending Chris McCann stabbed in the third then Ross Wallace curled in to make it 4-0 before half-time.
Ishmael Miller's low shot made it 4-1 on the hour but Charlie Austin's looping header gave Burnley a fifth.
Forest have just eight points from their nine games so far, and although they went into the game on the back of a win against Watford on Saturday, they were soon shellshocked by their hosts.
Rodriguez's first came after good work from Brian Easton on the left and his cross was headed back by Austin for the England Under-21 international to score.
Junior Stanislas was the creator of the second, crossing from the left for Rodriguez to score at the near post - and Austin could have made it three even before McCann stabbed home after Forest failed to clear a Stanislas corner.
Wallace made it four just before the break when he capitalised on Wes Morgan giving the ball away and fired in after a mazy run.
At half-time, McClaren had sat by himself for around 10 minutes in the dug-out while his players warmed up by themselves. Despite a better second-half showing, Forest were still heavily beaten.
Miller did get Forest on the scoresheet when he latched onto a long ball to score, but the Clarets had the final word when Austin's looping header from another Easton cross went in despite the best efforts of a defender on the line.
McClaren said: "At the end of the day, players cross the white line and they have to be responsible for performance so, yeah, we sent them out early at half time.
"It's for other people to decide about my job. But it's not about me or my job, it's about the team and, as normal after a defeat like that, we ask for a reaction.
"My assessment? Rubbish. Unacceptable for the fans who travelled.
"I didn't see it coming but it seems to be the story of the season - one step forward and three steps back. It's hurting us."