Back in the late 1979s, I briefly worked in a bank. On my first day I was instructed to go to the post office and return with some verbal agreement forms.
I spotted the problem immediately, and headed off to a screen printer where a friend worked. Between us we came up with two squares of cotton cloth on which were printed these words: "As verbal agreements are not worth the paper they're printed on, these use cloth. Acceptance of this form implies agreement."