From Wikipedia:
The ballot text reads "Do you agree with the reunification of Austria with the German Empire that was enacted on 13 March 1938, and do you vote for the party of our leader Adolf Hitler?," the large circle is labelled "Yes," the smaller "No."
Link -via Reddit
Obviously, they couldn't get away with big and small circles, but it struck me at the time how subtle the connotations of voting "Yes" or "No" were, in making separation sound positive, and staying as part of Canada sound negative.
It's interesting how they're also capitalizing on Adolf's popularity by having his name larger than the rest of the question. Have things really changed that much?