Erik ten Hag's bad start as Manchester United manager descended into an embarrassment as a 4-0 thrashing by Brentford on Saturday left the Red Devils bottom of the Premier League.
The former Ajax boss' reign began with Brighton's first ever win at Old Trafford last weekend, but much worse was to come as the Bees punished a series of errors to score four times in the first 35 minutes.
Josh Dasilva's strike slipped through David de Gea's grasp to open the floodgates before Mathias Jensen pounced on United's attempt to play out from the back to make it 2-0 inside 18 minutes.
Ben Mee then exposed the visitors' frailty from set-pieces for his first Brentford goal and Bryan Mbuemo rounded off a stunning counter-attack 10 minutes before half-time to sink United to the bottom of the table for the first time in 30 years.
The jubilant home support taunted Ten Hag with chants of "you're getting sacked in the morning."
But the Dutch coach has inherited a rabble rather than being the root cause as United lost a seventh consecutive away league match for the first time since 1936. That run included shipping four goals at Manchester City, Liverpool and Brighton last season.
The arrival of £57 million centre-back Lisandro Martinez from Ajax has done little to shore up United's leaky defence and questions will be asked of why Ten Hag has left Raphael Varane on the bench in favour of the Argentine and the out-of-sorts Harry Maguire.
Ten Hag did recall Cristiano Ronaldo to the starting line-up, but the want-away five-time Ballon d'Or winner played a part in the opening goal.
Ronaldo went to ground too easily seeking a foul as he was surrounded by Brentford bodies. Dasilva's shot should still have been a comfortable save for De Gea, but the ball squirmed underneath the Spaniard.
De Gea compounded that mistake eight minutes later with an attempted pass to Christian Eriksen, who was outmuscled by his former teammate Jensen, and the Dane coolly slotted home to double Brentford's lead.
Martinez was beaten at the back post by Mee for the third goal after Ivan Toney headed a corner across goal, and Thomas Frank's men produced a stunning move to tear United open again for their fourth goal.
Toney was released down the left wing and picked out Mbuemo with a precise first-time pass for the Frenchman to race in behind Luke Shaw and finish low past De Gea. (AFP)