A Peter Whittingham double inspired Cardiff City to fourth in the league as the Bluebirds ended their 39-year hoodoo at Watford in style.
Whittingham celebrated his 150th career start with an early penalty goal after Craig Cathcart had fouled Jay Bothroyd.
Adam Matthews' 50-yard free-kick doubled their lead after Watford keeper Scott Loach was completely deceived.
Whittingham's seventh this term secured the win before Jay Bothroyd smashed home for the division's top-scorers.
The Bluebirds followed up their 6-1 midweek thrashing of Derby County with a four-star performance at Vicarage Road, where the Welsh team have not won since October 1970.
But after teenage right-back Matthews had added to Whittingham's opener, the Welsh under-21 international scoring his first career goal, a Cardiff win was rarely in doubt.
Matthews, in just his ninth professional game, scored one of the finest goals he may ever score in his career as his long-range effort deceived Loach and sailed - helped by the wind - into the Watford net.
Cardiff had a penalty appeal rejected early in the second-half but the visitors did add a third in the 66th minute when former Aston Villa winger Whittingham scored a rare header from Gavin Rae's pin-point cross.
And Bothroyd latched onto a through ball and crashed in Cardiff's fourth - their tenth goal in a week - a minute later to end a personal 10-match goal drought in stunning fashion from just inside the penalty area.
Cardiff keeper David Marshall ensured Dave Jones' men kept their first clean sheet in five games as he made a superb point-blank save from Nathan Ellington's close range turn and shot - Watford's best chance of the game.
Michael Chopra, Cardiff's four-goal hero against Derby on Tuesday, almost added a fifth late on but the Championship's top-scorer unusually failed to add to his impressive 12-goal tally this season.
And Cardiff were handed a further boost as last season's top-scorer Ross McCormack made an earlier than expected comeback from a hamstring injury as he replaced Chopra.
Jones' men have reacted positively following four defeats in five league games with back-to-back wins and Cardiff are now the division's top goal-scorers.
Watford manager Malky Mackay said:
"To give the two cheap goals away in the first half, like we did, means you have a mountain to climb.
"I have been in the division long enough to realise that you are going to have tough times and times when you have to stick together.
"It is in times of adversity that you make sure you have a good group. We are not in times of adversity but when you come off a defeat like that you make sure you stick together."
Cardiff City manager Dave Jones said:
Interview: Cardiff City manager Dave Jones
"The last couple of weeks we have been talking about consistency. We are still a bit hit and miss sometimes with certain things that we do.
"When you're on a run you have got to try and hit the consistent run and try and keep it going. It was important today to come away with something. It was a good team performance carrying on from Tuesday night.
"If you go into the international break having won two on the trot then you can't wait for the next game."
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