Wanting to see if it would accepted, we placed it in a deposit box (to nullify the effect of facing the cashier).
I put the Greek letter Π in the numerical field and “פאי” (“Pi”) in the textual field.
This is a forgery based on a sample from Wikipedia
Several days later my account was debited by 3.14 NIS (~1$), I was a bit peeved that they rounded Pi to only two decimal points but decided it’s as good as I could have expected.
I called the bank and asked for a photocopy of the offending cheque (this was before you could see cheques online), the person taking my call was rather surprised since the fee for ordering a photocopy cheque to be sent was higher than the cheque’s amount.
All this was before I heard of Knuth’s custom of writing cheques for hex-dollars.
This story has a sad ending since I lost the photocopy of this cheque one of the times I moved…