How is this even possible unless you’re blind?

How could this even happen?

One would have to be literally blind or do it on purpose

Blind, I'd give a stretch. Even then, they'd have cc to be lucky to have actually installed all of that correctly, even if the order is wrong. (They probably could figure out the difference tho.)
Most likely on purpose, because it's hard to not know which one is the seat and lid.

Yeah a prank or revenge especially if they fed them brownies with ex lax in them shortly before doing this😂