Norwich fans had been waiting for Gary Hooper to make his first start for the club and he made an instant impact as his dramatic brace put the Canaries into the fourth round of the Capital One Cup at the expense of a spirited Watford side.
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The Hornets had led 2-0 at Vicarage Road with Javier Acuna and Davide Faraoni both scoring well-taken individual strikes either side of half-time to put the Sky Bet Championship outfit on the verge a minor upset.
But the visitors hit back with 15 minutes remaining as Josh Murphy continued the trend of scoring fantastic efforts with Hooper then equalising for Chris Hughton's side with the last touch of normal time.
The summer signing from Celtic then scored the winning goal of the game as he coolly finished when through on goal with just five minutes of extra time remaining.
Nathan Redmond, who has impressed in his first few outings for Norwich, forced a smart save out of Jonathan Bond in what proved to be the only real effort of a languid opening 20 minutes.
With both managers making eight changes to their respective sides it took the game a while to burst in to life but it was Paraguayan forward Acuna who struck midway through the first half to put Watford ahead.
He picked up possession on the edge of the Norwich box before firing an unstoppable shot past Norwich goalkeeper Mark Bunn, who could only get a despairing glove to Acuna's bullet.