A Penny For Your Thoughts...Actually, How About A Quarter

So heres something to think about. You're really, REALLY thirsty. You go to a vending machine and put a Loonie in and make your selection only to see "Selection not available" flash on the fancy-dancy display screen. Of course, you're annoyed so you push the coin return button and what appears in the coin return slot but 4 quarters. Seriously, are you telling me that this fancy computerized vending machine can't give me back a loonie when I put a loonie in. That's annoying.

Why won't you just give me my loonie back...