The Red Devils bagged six goals before the Dutchman entered the fray as he watched from the touchline.
And United supporters loved the 23-year-old's reaction to watching his team score.
Van de Beek cut a hilarious facial expression as Daniel James slotted past Illan Meslier.
He also pulled a priceless expression when United scored against Sheffield United last Thursday.
One United fan wrote: "He cares so much and is so positive all the time."
A second tweeted: "The mentality we need at the club."
A third joked: "He's like the more aesthetically pleasing version of Phil Jones, facial gesture wise."
United's spectacular win over Leeds moves them to third in the table with 26 points on the board.
They resume their league campaign against second-placed Leicester City on Boxing Day.
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