Watford moved up to third in the Championship with a thumping victory against struggling Preston North End.
Domingo Quina smashed Ismaila Sarr's cross past Declan Rudd on the volley before Joao Pedro's tap-in from Troy Deeney's cross was ruled out for offside.
The lead was doubled when Deeney smashed a penalty through Rudd's hands after Sarr went down under Jordan Storey's challenge before Tom Barkhuizen's heavily deflected shot halved the deficit.
But Nathaniel Chalobah quickly restored the Hornets' two-goal lead with a fine half-volley after a one-two with Deeney, and Pedro plundered a fourth via James Garner's corner and Craig Cathcart's flick-on.