India, Dec. 22 -- Pittsburgh Steelers wide receiver DK Metcalf courted a massive controversy in the game against the Detroit Lions on Sunday after appearing to punch a fan during the game.

Metcalf walked over to a Lions fan in the audience, and the two briefly exchanged some words before Metcalf appeared to reach out to him and tried to punch him. The moment was captured on the broadcast, with fans slamming the wide receiver for the punch at the fan.

Under NFL rules and policies, punching a fan is a serious violation with both league and potentially legal consequences.

Here's a video of the moment on Sunday night:

The fan was seated in the front row of the Steelers bench, wearing a blue wig and was holding a No. 4 DK Metcalf Steelers ...