Termites will eat money.

(Termites infested an Indian bank, in the state of Uttar Pradesh, and ate their way through banknotes worth millions of rupees. Luckily the bank will cover the losses, but this isn’t an isolated incident, one poor bloke, a Mr Prasad, from the Indian state of Bihar, wasn’t so lucky. He deposited currency notes and investment papers worth hundreds of thousands of rupees in a bank safe, only to find them munched to dust a few months later. The bank put up a notice warning customers of the termites, and won’t refund him. I guess this is why gold is so popular.)