Robin van Persie hailed his late winner as a special way to celebrate his first Manchester derby.
The Dutchman's deflected injury-time free-kick earned United a 3-2 win at the Etihad Stadium after City had come back from 2-0 down.
Wayne Rooney netted twice before the break, with Yaya Toure and Pablo Zabaleta snatching goals for the hosts in the second half.
Van Persie said: "We had a really good start, because of Wayne's two really good, clinical finishes.
"We were in control but City always come back. But it's a really special way to end this game, with the three points in a really dramatic way."
Rooney said of his team-mate's winning goal: "We work on that on the training ground and I had no doubt he could score from there."
The Fir Park side claimed their first home victory in over three months in the Clydesdale Bank Premier League with Lasley hitting the decisive strike eight minutes from time.
However, there was still time for one...