Or he's a jackass, or he's a something-or-rather, or ... You'll get a variation of this sentiment on Twitter right now if you're looking because Harper is wearing red contacts:

DEMON! DEEEEEEEMON! Combined with the faux-hawk, the black-metal corpse paint, and the expectations we had of Harper before we realized he was normal and relatively grounded, the red contacts were the perfect thing to put people over the top!

Except, it probably has nothing to do with demonosity or team spirit. Players wear red contacts for the sun, or to pick the ball up better. From the USA Today:

The Baltimore Orioles' Brian Roberts, the majors' second-leading batter entering Thursday (.368), and the Chicago White Sox's A.J. Pierzynski are among more than two dozen big-leaguers fitted with tinted contact lenses developed by Nike and Bausch & Lomb and designed to make the ball stand out.

That was seven years ago. This isn't about Harper bleedin' Natitude through his eyeballs. It's probably because he didn't like how he was picking up the ball, and the corpse paint didn't help as much as he wanted yesterday.

Besides, it'd be pretty stupid to have a "GOTTA BLEED RED" mindset when you're facing the Cardinals.