Canada, Eh?

I'm wondering if a "Do Not Enter" road sign means something else in Canada. I was pulling in to a local restaurant for dinner and saw a car with Canada plates pulling in the exit that had a big red and white sign reading "Do Not Enter". And they were on the sidewalk. His solution? Back up into the four lane road. When that failed he pulled back in the exit and came in the wrong way. Today's lesson learned? Do not make an illegal left turn into an exit only, drive on the sidewalk, back up onto a highway, just to pull in the wrong way.