Yeah, I remember back in my day. We didn't have them new-fangled toasting machines. We had to toast our bread over open fires. And we lived in caves. And those caves were damned cold. They didn't have no central heating. And we had to share the caves with bears and the Taliban.
That's right, we had to cook our toast over open fires in our Taliban and bear infested caves that had no central heating. Plus, the caves had bats, so we had bat**** everywhere, too. And you know how hard it is to vacuum up bat****? Especially since electricity hadn't been invented yet, nor had vacuums!
That's right, we were living in Taliban, bear and bat-infested caves that had no central heating and imaginary vacuums because we could only dream about something like electricity, and we had to toast our bread over an open fire, built on top of bat****, so it stunk to high heaven.
Except we couldn't dream about having electricity either. Nope, dreams hadn't been invented yet either. I don't think they came along until Sigmund Freud, and so if you were crazy, you had to stay in the cave all day.
You didn't mind, after all, you were crazy, but let me tell you...if it was your turn to watch the crazy guy, stuck in the Taliban, bear and bat infested cave all day, wishing you had a vacuum and some electricity because the fire was built on top of bat****, and the smell stunk to high heaven, you would have been damned glad to have some electricity and a new-fangled toasting machine. But the crazy people, they didn't mind. The smell didn't bother them, and they could stay in the cave all day.
And that, my friend, is how the term "bat**** crazy" came to be.
Wait...what were we talking about again?