Here's a history of them.
Monday, October 10, 2011
"The Solo Cup" by Seth Stevenson - Slate.com
Solo cups are pretty fucking awesome huh? So iconic. If you're drinking out of those red cups you are having fun. Straight fact. I played flip cup for the first time in years down in Baton Rouge recently and it was one of the more fun times I've had in 2011. Granted I was fire flames and flipped like 18 times total in 15 rounds and anchored my team like I was Michael Phelps but I'm not bragging. Solo cups rule. Suck it.