Although the Mexican is on spot-kick duty for his country, it was his first one in the Barclays Premier League since joining the Reds.
The unerring finish past Thomas Sorensen ensured Chicharito became the 13th player in the Premier League era to convert a penalty for Sir Alex's side.
The other 12 spot-kick scorers for United are:
David Beckham, Dimitar Berbatov, Steve Bruce, Eric Cantona, Ryan Giggs, Denis Irwin, Cristiano Ronaldo, Wayne Rooney, Louis Saha, Paul Scholes, Teddy Sheringham, Ruud van Nistelrooy.
Did you get them all? Look out for another teaser next Thursday.