By and large, most health trends nowadays are usually full of shit (no pun intended).

For one, they're regularly espoused by people who have almost zero credentials or bona fides in any kind of academic study of human physiology. Second, they often involve the most bizarre kind of acts in order to "detox" yourself. Third, this makes them very hard to take seriously, and makes you question who'd try it in the first place.

The latest trend is called perineum sunning, which involves - and we are not making this up - exposing your asshole to the sun's rays. That's right, folks - there are people who literally are attempting to have the sun shine down on their anus.

Anyway, the trend has gone viral on social media because of the utterly ridiculous photos, and even caught the (brown) eye of one well-known actor - Josh Brolin. In an Instagram post, Brolin explained the realities of perineum sunning to his millions of followers.

"Tried this perineum sunning that I’ve been hearing about and my suggestion is DO NOT do it as long as I did," Brolin began. "My pucker hole is crazy burned and I was going to spend the day shopping with my family and instead I’m icing and using aloe and burn creams because of the severity of the pain."

Brolin went on to curse the people who invented the trend, all of which caught the attention of the likes of Ryan Reynolds, Rob Liefeld, and several others in the comments.

Celebrities! They're nothing like us at all!