Fandom is everywhere these days, and now it's on the football field, too. NFL wide receiver Mohamed Sanu of the Cincinnati Bengals recently posted an awesome photo to his Instagram account, showing off his custom Joker-themed cleats.

The cleats, which appear to be hand painted, feature Heath Ledger's Joker from "The Dark Knight." Tally marks surround the shoe, including the Nike logo on the back. While one side features the Joker's face, the other side asks the famous question "Why so serious?"

Why So Serious? ️ #Joker #KOTD

A photo posted by Mohamed Sanu Sr. (@mohamedsanu) on

These special Joker cleats aren't the only fandom shoes Sanu owns. He also has a pair of "Dragon Ball Z" cleats.

Some Halloween for yours truly @dezcustomz @kreativecustomkicks #Authentic #LaFlame #FeastingSeason

A photo posted by Mohamed Sanu Sr. (@mohamedsanu) on

Both sets of cleats were designed and painted by KreativeCustomKicks.

(via ComicBook.com)