Sometimes the button-down National Football League, with its desire to make every player conform to the same uniform standards and its penalties for excessive celebrations, is known as the No Fun League. It’s enough to make someone ask, “Why so serious?”

So it’s only fitting that Cincinnati Bengal wide receiver Mohamed Sanu had a pair of custom cleats made up, adorned with Heath Ledger’s Joker and his famous line from The Dark Knight.

Sanu shared pictures of the cleats on Twitter and Instagram.

Why So Serious? 🃏🀄️ #Joker #DarkKnight pic.twitter.com/iSerHXw1Qr

— Mohamed Sanu Sr. (@Mo_12_Sanu) November 16, 2015

https://instagram.com/p/-J86TRpkE_/?taken-by=mohamedsanu

If you aren’t a football fan you might be wondering why the lettering is black and orange. It’s because those are the Bengals team colors, and Sanu said he planned to wear them for last night’s Monday Night Football game. Like The Joker in The Dark Knight, the Bengals lost a game they definitely thought they were going to win.

It’s unclear as of now whether or not Sanu was given approval by the NFL to wear these cleats. Considering they recently fined a player for wearing non-approved patriotic cleats on a day the NFL was celebrating Salute to Service Week (no, really, they did that), it’s tough to really make sense of their policy.

The cleats were made by Kreative Custom Kicks, but this is not the first time Sanu rocked some nerdy footwear. Earlier this year he wore a pair of Dragon Ball Z cleats, and he’s had ones with The Hulk and Iron Man made in the past.

https://twitter.com/Mo_12_Sanu/status/659863057666080768

The Bengals are 8-1 and one of the better teams in football. If they were to ever make it to the Superbowl you’d have to wonder what Sanu might cook up for that.

What do you think would be a good enough design for the Superbowl? Tell us your best ideas in the comments below.

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HT: Comicbookresources