I tried doing that the other day while he was feeding the birds and sitting down, but for some reason he didn't give me any throwing beans. I heard an insane rumor that you have to do it at a specific time of day, or that he has to be standing up. I do want some throwing beans though.. they're really fun. I guess it was Nintendo's way of giving those of us who don't live in japan a chance to get our hands on the beans.