The match at Vicarage Road started in a different way.
In a bizarre penalty situation, David De Gea became a lifeguard twice.
Ismaila Sarr struck a penalty which the Spaniard saved.
The return was called in, but a Watford player was too early in the penalty area and the penalty went over.
De Gea was in the way that time as well and made sure that the match was still open.
But De Gea probably prefers to forget what happened later.
Joshua King made it 1-0 in the 28th minute.
Ismaila Sarr then took revenge and extended the lead to 2-0
At the start of the second half, Donny van de Beek gave a streak of hope to Manchester United through a reduction.
But after Harry Maguire picked up a second yellow card, it was only a matter of time before Watford would strike again.
Twice to small it to be exact.
Watford's Joao Pedro and Emmanuel Dennis set the final score at 4-1 with one goal each.