As always, make sure that you fuck over Shiny Pony and his evil government by denying them what they so desperately seek: data on you.
If you were given a long-form census (or even a short-form, for that matter) it's your duty as a Canadian Patriot to make sure the information they get is even worse than useless. As I noted before, they don't exactly send auditors to verify what they told you: indeed, the reason they want you to provide the information is because it's a variety of difficult and impossible to find it out themselves.
