Cash Me If You Can

"It came in a junk-mail letter, pushing a get-rich-quick scheme. It was a check for $95,093.35, made payable to my name, but clearly bearing the words "non-negotiable" in the top-right corner. For no other reason at all than a joke, I deposited it into my bank's ATM. To my absolute astonishment - it cashed! Thus began the wildest adventure I've ever been on in my life."