wtf? why do dark humor memes involve with crates?

but seriously why did 2 dark humors had crates is it because of something?

Recent viral phenomena called the "milk crate challenge" where people attempt to ascend a milk crate pyramid often to injurious results.

so I guess its a way of self injuring

its the crate challenge. ppl get seriously injured from it

its the crate challenge i was reading in school snorted too loud lol