I didn't! Like I said, it just came up and took the thing. (There wasn't that much left in the can.) I didn't go after him and I didn't try to feed him.
This was at a park. The kangaroos--actually in this case a wallaby--were wild, but the kind of wild you find in squirrels and pigeons that live in cities. That is, not pets, but not that afraid either. They know humans = food.