Peyton Manning and the NFL's Twitter account mocked him, writing, "Stick to playing receiver."
For Week 8's game against the Bengals, the Browns dialed the receiver's number in a double-reverse trick play.
He was expected to read the Bengals' defense after receiving the ball from Nick Chubb and then hit a deep throw.
The Bengals, though, were prepared for the ruse.
They applied pressure on Cooper and seemed like they had the play covered, but Cooper's mistake still caught the eye of NFL fans and the media.
Peyton Manning, Eli Manning, and ex-Bengals quarterback Boomer Esiason were all tuning in to the game on the Manningcast.