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I come from Canada, and I was shocked

That's odd, because we've had them for quite some time (and played beer pong with them). </Ontarian>

Growing up in Alberta, the Red Solo Cup has also been a staple of every house party I've ever been to.

McMaster university. Never saw beer pong. Or the ubiquity of the solo cup (sure there are red cups in Canada, but in the us they are everywhere)