West Ham goalkeeper Joe Hart admits he couldn't believe the manner of their collapse against Crystal Palace.
Wilfried Zaha hit an injury-time equaliser to secure a 2-2 draw for Palace.
"I can't believe we've done that," Hart told the official club website. "I can't believe we've fought all the way to the end and then been so unprofessional at the end.
"It's a little bit speechless in the dressing room. No one does things on purpose in this team, but it's two points dropped - as simple as that.
"I hadn't switched off, but it was a good finish by Zaha, through legs, and I'm bitterly disappointed."
West Ham came under sustained pressure in the last 10 minutes, but they were naive too at the end.
"You've got to keep the ball in the corner, it's that simple, and you can't let people keep running through you and getting chances,' Hart said.
"Today counts for a point, but that's about it. We learn simple things."
Source: tribalfootball.com