Gary Neville was surprised after David De Gea made a costly error that interrupted Jose Mourinho's pre-match interview.
Manchester United conceded a cheap goal after the Spaniard could not properly handle Ismaila Sarr's weak shot.
And Red Devils' legend Neville watched in despair as his former team were 1-0 down courtesy of the mistake from the 29-year-old.
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Mourinho was being interviewed by Sky Sports journalist Geoff Shreeves ahead of Tottenham's match against Chelsea when the incident happened on the TV screen.
Shreeves could not help it but stopped the interview and have the camera show Neville's reaction and jokingly called him out for disturbing his interview with Mourinho.
He said: "Last thing [Mourinho], now you've experienced being a pundit in the television studio, your opinion on the unprofessional nature of Gary Neville?
"You and I are doing a professional interview and he falls to the floor in disgust. What does that tell you about his lack of standards?"
Mourinho saw the funny side of the incident and sympathized with the former Red Devils captain.
"I think Gary cannot hide his United connections [laughs], but he is a very good pundit," the 'Special One' said.
Troy Deeney went on to double the advantage for Watford from a spot-kick as the Hornets recorded only their second win of the season.
Meanwhile, Legit.ng had earlier reported that Jordan Henderson wrapped up 2019 by helping Liverpool win Club World Cup following the 1-0 victory over Flamengo in Doha.
The England international has now added another trophy into his kitty which is more than what the last three Man United captains have achieved over the years.
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