There's a guy at my gym who does these. Sets up the trap bar in one of the squat stands. He'll do some other unconventional stuff like safety bar squats with the bar straddling his face to be more like a front squat. He squatted 617 at 198 with just knee sleeves so it's not like he's weak and a weirdo.
There's an area in our gym that is only covered by 3/4" rubber matting. Dude cracked the floor underneath only deadlifting 315 with iron plates. Bumpers are okay though.
Pretty dumb because we have deadlift platforms with a couple layers of plywood and then the horse stall mats on top of them.
A certain well known powerlifter I know (who squats a lot more than kstar) injured his hip pretty badly early last year messing around with a "toes straight" stance. Paraphrasing, but "always open to making form tweaks, but that one? never again"