Canada

Over the years I've gotten a few letters from companies for ridiculously small amounts (amounts that were smaller than the cost of even sending a bill). Rather than pay the 38 cents, or whatever they were asking, I'd send some amount that was maybe 50 cents higher than what I owed. Then, I'd wait for them to send me a check for the amount that I'd overpaid, which cost them more money. Of course, I wouldn't cash the check, which would lead them to following up with a new check for the same amount six months later. This could go on every six months for a while, and certainly cost them more than the original amount they'd been so pettily after me for in the first place. I never kept their 'refund' checks or really looked at them closely. I suppose they had verbage on them that caused them to expire in 6 months time, but if not, I regret not holding on to them until I could cash 3 or 4 of them simultaneously, just to see how that would play out.