A controversial goal from Tony Thorpe helped play-off hopefuls Luton secure an easy 3-0 victory over Huddersfield.
The relegation-threatened Terriers were furious when Thorpe's opening goal in the 50th minute was allowed to stand despite the Hatters striker clearly being three yards offside.
Huddersfield captain Kenny Irons and Martin Smith were both cautioned for their protests.
A frustrated Irons was then sent off two minutes later for following through on Luton left-back Sol Davis and Huddersfield went on to concede further goals from Hatters substitute Peter Holmes and top scorer Steve Howard.
Luton managed 11 goal attempts to Huddersfield's one in a one-sided first half with Howard coming the closest when he hit the post.
The visitors' only effort was a fierce 25-yard drive from Chris Holland that was straight at recalled Luton keeper Carl Emberson.
Thorpe's goal came when Matthew Spring dispossessed Holland and the ball broke for the ex-Fulham striker.
Most of the crowd expected a flag to be raised but Thorpe carried on to round keeper Phil Senior and tap into an empty net.
Irons' dismissal effectively ended any chances of Huddersfield taking away a point.
Ahmet Brkovic hit the bar for the home side in the 68th minute with a volley from the edge of the box before Holmes added a second goal moments later.
Fellow substitute Ian Hillier delivered a fine cross from the right that was only half-cleared to Holmes, who shot through Senior from eight yards.
Howard then netted his 16th goal of the season in the last minute, volleying into the bottom corner from an acute angle after Holmes' deep cross.
Furious Huddersfield boss Mick Wadsworth said after the match: "The first goal was an absolutely hideous, disgraceful decision. I've never seen one like that in all the time that I have been in football.
"It was like the one that the schoolteacher misses because he does not know the rules. The referee and the linesman can have no justification for it.
"There's not even any doubt. It was bizarre and the whole ground knows that."