What's up with that? Mario Williams rocks red contact lenses

NFL players are known to express their individuality. It's harmless fun, usually in the form of eyeblack patters or maybe even a special big-play celebration.

However, Buffalo Bills defensive end Mario Williams took it to another level on Sunday:

So Mario Williams is, um, the Keymaster. pic.twitter.com/n9FenH5IeR
— Eric Kay (@ekaycbs) November 9, 2014

Wow. Is that a photo effect? Looks like it isn't:

That's cool. And freaky. And also not unique. Another helpful soul on social media spotted Falcons defender Kroy Biermann rocking red lenses as well:

I see a Falcons player with red contacts. If I were a pro athlete, I'd wear all black contacts to freak people out. pic.twitter.com/1IrrgjVXhO
— Alex Kennedy (@AlexKennedyNBA) November 9, 2014