Former Kansas running back Jon Cornish of the Calgary Stampeders is the leading rusher in the Canadian Football League.

So you could understand his frustration when the Saskatchewan Roughriders held him to just 67 yards in a 30-25 loss on Sunday.

But what he did next turned some heads, in some cases literally, as he reportedly mooned the Roughriders crowd at Mosaic Stadium in Regina, Saskatchewan.

According to the Calgary Herald, Cornish wrote on Twitter that the incident was a “equipment adjustment”

Cornish, a British Columbia native who played at KU from 2002-06, then apologized.

“That incident was a mistake on my part,” Cornish told the Herald. “I definitely just took it one step too far, or maybe a few steps too far. It reflects poorly on the organization.

“First of all I want to apologize to Coach (John Hufnagel), all the coaches, my teammates, all the Stampeder fans, the Stampeder organization and the Rider fans. They don’t deseve that.

“It was a bad call on my part. It was an extreme lack of judgment.”

It’s not the first time the CFL has seen something this odd. In 2009, former Olathe North star Arland Bruce of the Toronto Argonauts was fined for his Michael Jackson tribute after a touchdown in which he took off his helmet, jersey and shoulder pads and laid down in the end zone with his arms crossed. In 2008, Bruce put on a Spider-Man mask as a TD celebration.