What is the link between guano and insanity? What is the history of the saying "bat sh*t crazy"?

Question

What is the link between guano and insanity? What is the history of the saying "bat sh*t crazy"?

Answer 1

The original American expression is "Bats in the belfry" : 'someone who acts as though he has bats careering around his topmost part, i.e. his head'. Hence, "batty". The "sh*t" part makes it only stronger.

Answer 2

i don't have a clue on what you are going on about, this a trick question?  

Answer 3

Hypothesis:

Standard etymology:

Bat **** is used as synonym of extreme or beyond normal, because it is , under many points of view: hyper smelling, quite disgusting, present in some places in huge quantities because bats have community places, where they merrily release

Other suggestions:

-guano is extremely smelling and sudden, unexpected  contact let you act insanely

- Bat-**** fells on heads unexpected and unseen (in a cavern, by night, in Gotham city) so people reacts insanely without apparent reason

- Guano is extremely slippery: if you put your feet on bat **** you will loose balance and start acting apparently in a crazy and unjustified way

- It is not bat-**** crazy but bat ****-crazy: bats are clean animal they cannot bear the presence of ****, otherwise they become mad

- it is not bat-**** crazy it is butt **** crazy (obvious reasons)