Watford thumped Premiership side Southampton to cruise into the quarter-finals of the Carling Cup.
Bruce Dyer headed the Hornets ahead from a superb Neal Ardley free-kick.
James Chambers volleyed in from an Ardley corner to make it 2-0 and fired a second from Dyer's pull-back before Heidar Helguson crashed in a fourth.
Dexter Blackstock's tap-in and Brett Ormerod's header got Saints on the scoresheet while Hameur Bouazza hit the home side's fifth in between.
Under-fire Southampton head coach Steve Wigley was hoping to ease some of the pressure on his struggling side by guiding them into the last eight of the cup.
But this shambolic display will have done nothing to convince the doubters Wigley deserves to keep his job as they were completely outplayed by a Watford side currently lying ninth in the Championship.
Dyer was Watford's main threat, sending a low shot narrowly wide and blasting over the top as the home side looked to take advantage of a Saints side still searching a first League win under Wigley.
At the other end, Anders Svensson saw a free-kick flash across the goal and keeper Richard Lee rushed off his line to deny ex-Watford striker Kevin Phillips.
Mikael Nilsson missed a glorious chance to put the visitors ahead when he badly miskicked from Paul Telfer's cross.
But it was inevitable Dyer would be the man to provide the breakthrough when it came six minutes before the break.
The former Crystal Palace frontman reacted first to Ardley's superb inswinging free-kick to powerfully head the Hornets in front from eight yards.
Watford continued to threaten from set-pieces and another wicked delivery from Ardley was flicked on by Dyche and Chambers volleyed in his first senior goal on 52 minutes.
And Chambers only had to wait 10 minutes for his second, driving the ball home with the aid of a deflection after more fine approach play from Dyer.
By this stage the Saints were being ripped apart and Brynjar Gunnarsson's delightful through-ball saw Helguson make it 4-0 with a stunning volley just three minutes later.
The visitors finally got on the scoresheet after 83 minutes when two substitutes
combined and Blackstock converted Leandre Griffit's pass.
But seconds later Helguson teed up Watford's own substitute Bouazza to shoot past Alan Blayney the home side's fifth.
Griffit set up a second away goal late on, crossing for Ormerod who headed in off the bar.
Watford: Lee, Ardley, Gunnarsson, Cox (Demerit 85), Dyche,
Dyer (Bouazza 75), Mahon, Darlington, Helguson,
Chambers (Young 71), Doyley.
Subs Not Used: Chamberlain, Fitzgerald.
Goals: Dyer 39, Chambers 52, 62, Helguson 66, Bouazza 84.
Southampton: Blayney, Lundekvam, Jakobsson,
Phillips (Blackstock 64), Anders Svensson, Delap, Higginbotham,
Kenton (Van Damme 64), Telfer, Nilsson (Griffit 45), Ormerod.
Subs Not Used: Crouch, Poke.
Goals: Blackstock 84, Ormerod 88.
Ref: B Knight (Kent).