Jose Mourinho was sent to the stands as Manchester United were again frustrated at home with a 1-1 draw against West Ham.
Diafra Sakho gave the Hammers the lead after just two minutes when he headed in Dimitri Payet's free-kick.
But United responded midway through the first half when Zlatan Ibrahimovic flicked past Darren Randolph from Paul Pogba's pass over the top.
Pogba was booked for diving shortly afterwards, an incident that enraged Mourinho and saw him sent from the sidelines for kicking a water bottle in frustration.
It is the second time in the space of a month that Mourinho has been sent to the stands after his dismissal during the goalless draw against Burnley.
And his mood was unlikely to have improved much as he watched his side held at home for the fourth successive match in the Premier League.
As in recent games at Old Trafford, United created chances to take the lead, but they could not find a way past Randolph, who made several key stops.
Ibrahimovic returned from suspension for the hosts while Bastian Schweinsteiger was named in the squad for the first time this season.
With Winston Reid suspended for West Ham, James Collins started in defence, and Mark Noble returned to the side.
The Hammers made a dream start as, in the second minute, Payet fizzed a free-kick across goal and Sakho nodded in ahead of Ibrahimovic.
The goal seemed to stun the home fans as well as the United players, who took a while to respond.
Eventually, they started to take control and Ibrahimovic atoned for losing Sakho for the opening goal when he headed Pogba's perfectly-weighted pass beyond Randolph.
Pogba was involved in the action again in the 27th minute, receiving a yellow card for diving.
The incident angered Mourinho, who kicked a water bottle into the air in frustration and was subsequently sent to the stands.
But United finished the half strongly and started to create more chances.
Jesse Lingard volleyed over from close range before Marcus Rashford, whose last goal was two months ago, failed to beat Randolph after being played through on goal.
Ibrahimovic then headed wide before seeing a shot stopped by a brilliant block by Angelo Obgonna.
Randolph saved well from Lingard late in the half, but West Ham created chances of their own after the break, with David de Gea tipping over an audacious long-range free-kick from Payet and Sakho heading over from a corner.
Wayne Rooney, who is one goal short of equalling Sir Bobby Charlton's scoring record for United, went close after coming off the bench but his low shot lacked the power to trouble Randolph.
In a frantic finish, both sides created opportunities to take the lead.
Randolph made a sharp stop to turn Henrikh Mkhitaryan's effort on to the post before the Hammers keeper palmed away a shot from Pogba that was heading for the bottom corner.
Collins then played Randolph into trouble with a backwards header that was short, but Cheikhou Kouyate cleared before Ibrahimovic could turn into the empty net after his touch took him around the keeper.
Ashley Fletcher, who left United for West Ham in the summer, almost snatched a winner for the visitors on the counter in the final few minutes, but was denied by De Gea from close range.
Player ratings
Man Utd: De Gea (6), Valencia (7), Jones (6), Rojo (6), Darmian (6), Herrera (6), Pogba (6), Lingard (6), Mata (5), Rashford (5), Ibrahimovic (7).
Subs: Rooney (5), Mkhitaryan (5), Fellaini (5).
West Ham: Randolph (8), Kouyate (7), Collins (6), Ogbonna (7), Antonio (6), Obiang (6), Noble (6), Cresswell (7), Lanzini (5), Payet (7), Sakho (7).
Subs: Feghouli (5), Ayew (5), Fletcher (5).
Man of the match: Darren Randolph.
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