Was looking up something completely unrelated and came across this article for "Screamers," which are a different name for the Hurricones that I had mentioned earlier. I have no idea when the Moose Jaw convenience store started selling them, but it has been YEARS. This article claims that someone in Prince George has been selling them since at least 1989, but nobody supposedly knows who really started it. It is, theoretically, a Canadian invention though. Add that to the list of great Canadian inventions along with insulin, Hawaiian pizza, and the zipper.
7-Eleven may help spread the 'Screamer' but drink's origins still a mystery
(Just trying to post as many informative links as I can in order to maintain my quota.)