Otherwise, why describe someone as “bat shit crazy”?
I’ve read that toxoplasmosis, transmitted in humans primarily by contact with cat poop, is linked to certain kinds of schizophrenia… Perhaps as a factor in the “crazy cat lady” phenomenon (though that’s supposed to be more of an “animal hoarder” type of thing). Yet nobody’s called “cat shit crazy”. Just bat shit.
Bat shit is a source of nitrates that can be used to make explosives. That’s why people who go nuts and start blowing things up are called… wait … this isn’t the fun facts thread is it?