Save them for the next time?
Or what I do with American coins, leave them in a pile which I say to myself "I'll take them next year", but forget and the next year add to the pile
I just got back from a trip to Canada and my bank won't take them in a currency exchange (only paper bills). Is this why America's cash registers are littered with random Canadian coins? I always wondered how when I buy something, every so often, someone gives me a Canadian penny.
Send them to one of the Canadian boarders.
Give them to people who won't complain. Use them at places like McDonalds, you usually won't catch flak for it.
Spend it just like a US coin. If a storeowner gives you grief, say "It's real coinage, and if we pretend it's US coinage, then no harm, no foul. The entire monetary system of the world is predicated on the idea that this worthless stuff we pass around is, in fact, not worthless. If the customer you hand this to has a problem with it, just tell him what I told you."
Wrap 'em in a coin roll with American coins. That'll learn 'em.
Please don't. My work comp premiums are high enough already.