Well, I was going to make a joke about the fact that well, this is in the US, and 2, it's in California. Neither would bode well on the IQ front for many things, but anyway...If there was a way for an American to convince himself that ripping a dollar bill in half actually increased the value of it to $2? Well, that's the level of stupid I think the average American is. The fact that someone else actually used the word stupid just made my point a lot easier.
LOL. But back to the coin...Not only would I immediately hear the world "gold" and perk up my ears, I would ask if I could take a peek at the coin. If he said, "No," then I would know it is more than likely real. If he agreed, then it would probably be fake.
Either way, the fact it is Canadian would be a bonus. I would take the coin in a heartbeat, take it in to see how much it was worth at the coin shop, and then turn around and sell it.
Then I might try changing my hair and clothes to see if walking around the block a few times would give me a second offer for a second gold coin. LOL. He may or may not recognize me, but I don't believe there would be any harm or sin in trying.
But knowing me, if he didn't? I would give him back the second gold coin and say, "Hey, it's me. Thanks so much for the first one, please donate this one to charity."
I have run after people on the street if I see them dropping a quarter.