Leicester eased past Watford to earn manager Martin Allen his first league victory of the season.
Iain Hume opened the scoring, crashing a fierce right-foot shot past Mart Poom and in off the crossbar.
Mark De Vries teed up DJ Campbell who finished from close range to make it 2-0 and Alan Sheehan's deflected 25-yard shot put the Foxes in control.
De Vries's shot made it 4-0 and Marlon King's penalty completed the scoring after Gareth McAuley's handball.
Leicester: Fulop, N'Gotty, McAuley, Kisnorbo, Clarke, Hume (Kaebi 79), Clemence, Sheehan (Kishishev 85), Wesolowski, Campbell (Chambers 62), De Vries.
Subs Not Used: Henderson, Porter.
Booked: Campbell, McAuley, Clemence, Chambers, Fulop, Kishishev.
Goals: Hume 15, Campbell 51, Sheehan 54, De Vries 85.
Watford: Poom, Doyley, DeMerit (Hoskins 83), Shittu, Stewart, McAnuff (Mariappa 86), Mahon, Williamson, Smith, King, Kabba (Priskin 68).
Subs Not Used: Lee, Bangura.
Booked: Mahon, King, Kabba, Shittu, Stewart.
Goals: King 90 pen.
Ref: Anthony Taylor (Greater Manchester).
Leicester boss Martin Allen:
"It's good to get a win, for the players and supporters, but it's only three points.
"I thought the referee was distinctly average, I couldn't get my head round some of his decisions.
"But we've now got a good, big squad of players, and every one of them knows they have to earn their place."
Watford manager Adie Boothroyd
"This could be our best result of the season, we got the boot up the backside our performance deserved.
"We earned a reputation in our first two games. We perhaps turned up today thinking everyone was afraid of us.
"But leicester weren't and you have to make sure your score in your dominant periods, and make sure you don't give away goals."