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The Cowboys thought they had a first down in the red zone early in Sunday’s game against the Packers after a 22-yard gain by wide receiver Terrence Williams, but the play was called back and then some thanks to a penalty that comes up rarely.

Wide receiver Brice Butler was penalized for unsportsmanlike conduct after he came into the huddle and then left the field without participating in a play. NFL rules say that if a player “approaches the huddle and communicates with a teammate,” he has to remain in the game to bar teams from creating confusion about which players are in the game. The 15-yard penalty put the Cowboys back into their own territory.

“Never heard of it in my life,” Butler said, via the Dallas Morning News. “[We] couldn’t beat the stripes. You can quote me on that.”

Cowboys coach Jason Garrett said he’s never seen that call before. Referee Tony Corrente told a pool reporter after the game that it isn’t “an obscure rule” and that Butler “has to stay either in the game or they can call a timeout and get out of it.”

The Cowboys tried passes to Butler on the next two plays, but both fell incomplete. Butler finished the day without a catch and said he “played like trash” in what will be his final game for quite a while.