Making a snack that's based around dunking isn't an original idea. The British have been dunking biscuits in their tea for centuries. We can't put our fingers on why Dunk-a-roos were the masters of the dipping and dunking game, but we're positive that they were.
We all still remember the agony of running out of dip before we ran out of cookies, and it's a pain that Canadians still know today. For some reason, it's only the USA that has stopped selling them. They're still available everywhere else!