Watford cruised past Luton on derby day to end the visitors unbeaten run.
First half goals from Keinan Davis and William Troost-Ekong were added to after the break by João Pedro and Ismaïla Sarr in a memorable afternoon for Watford.
Gabriel Osho was sent off for Luton in the closing minutes to cap off what was a comfortable day's work for Slaven Bilić and his team.
Watford came into the game off the back of a hugely disappointing defeat at Millwall in midweek, whilst Luton were looking to extend their unbeaten run to eight games.
It was a gloomy morning in Hertfordshire with torrential rain and dark clouds hanging over Vicarage Road. Whilst the sun came out by kick off, the derby day storm was very much still brewing for Watford.
The hosts started the game in the best possible fashion when Davis acrobatically opened the scoring inside three minutes. It was a sensational finish by the Aston Villa loanee and it set the tone for the frantic rest of the match.
There was a clear derby-like feel to the game in what was an end to an end start to the first half.
Luton almost equalised immediately after Davis' opener when Allan Campbell's shot went agonisingly wide of the post and left Daniel Bachmann rooted to the spot.
Davis was a constant thorn in the visitors side throughout the opening exchanges and he could easily have made it two after ten minutes. He ran the length of the Luton half only to be denied by goalkeeper Ethan Horvath who tipped his effort wide of the post.
The visitors struggled to create many meaningful chances throughout the afternoon but could have found themselves level when Elijah Adebayo's looping header dropped just over the bar.
It was Slaven Bilić's men, though, who grabbed the second goal of the game just before half time. Davis was at the heart of everything Watford were doing and his header across the face of goal was wilfully tapped in by William Troost-Ekong.
It capped off a fantastic half of football by Watford and the atmosphere from the home fans reflected their dominance.
Luton manager Nathan Jones would have ben expecting a response in the second half from his team but their task was made harder by gifting Watford their third goal.
Davis was involved again as he hassled and pressurised Horvath which led to the American keeper passing the ball straight to João Pedro. He had enough time to control the ball, steady himself and calmly slot the ball away to send Vicarage Road into raptures.
The goal killed off Luton and they weren't able to threaten the Watford goal again. The home side saw the game out comfortably and ten minutes from time they made it four.
It was another goal of Luton's own making. Edo Kayembe won the ball in midfield after a misplaced pass and the ball made its way to Sarr via Vakoun Bayo who made no mistake.
It was an afternoon to forget for the Hatters who were lacking in almost every aspect of their game. It clearly got to the players and Gabriel Osho was sent off with ten minutes remaining for a reckless and dangerous lunge on Ken Sema.
The result sees Watford move to tenth in the league and just one point off Luton.