OAKLAND, CA - DECEMBER 2: Oakland Raiders head coach Jon Gruden yells from the sideline during the fourth quarter of their game against the Kansas City Chiefs on Sunday, Dec. 2, 2018, in Oakland, Calif.

Gruden tries to challenge scoring play for 2nd time this season

Digital First Media/East Bay Times via Getty Images / Digital First Media / Getty

Oakland Raiders head coach Jon Gruden cost himself a timeout Monday by trying to challenge a scoring play - which is against the rules - for the second time this season.

Gruden threw his red flag after Denver Broncos quarterback Case Keenum nearly ran past the line of scrimmage before throwing a touchdown pass. However, because all scoring plays are automatically reviewed and can't be challenged, Gruden was penalized a timeout.

.@CaseKeenum scrambles and finds @SuttonCourtland for the 19-yard TD! #BroncosCountry

📺: #DENvsOAK on ESPN pic.twitter.com/q12WzUKDcL
— NFL (@NFL) December 25, 2018

The mishap sparked plenty of reaction on Twitter:

Jon Gruden shattering the single season NFL record for challenging unchallengeable plays was the biggest lock in NFL history.
— Will Brinson (@WillBrinson) December 25, 2018

Jon Gruden just challenged a scoring play, which can't be challenged. That's the second time this season he's done that; he said earlier in the year that he sometimes challenges when he knows he can't just to send a message to NFL VP of Officiating Al Riveron.
— Michael David Smith (@MichaelDavSmith) December 25, 2018

Jon Gruden threw a challenge flag on a Broncos TD, even though those are automatically reviewed already pic.twitter.com/5Nkq76CYU4
— SB Nation (@SBNation) December 25, 2018

Jon Gruden challenges a play with an ex official in the booth that works for the Raiders to help with these type of situations. #WTF
— Lawrence Tynes (@lt4kicks) December 25, 2018