Red Solo cups are the unofficial cup of parties: for beer pong, flip cup, or just straight up drinking. And there’s a rumor going around Facebook that Red Solo cups are actually smarter than you realized. Supposedly, those lines that wrap around the different sections of the cup aren’t just for decoration; they’re actually measurements.
The first line above the base is supposedly the one-ounce mark, if you’re having liquor. The next line is at five ounces, if you want to be classy and drink wine from your plastic cup. And the third line up is at the 12-ounce mark, for one full beer.
But according to Snopes.com, it’s an urban legend. They contacted the Dart Container Corporation, which makes the cups, and they said, “The lines on our Party Cups are designed for functional performance, and are not measurement lines. If the lines do coincide with certain measurements, it is purely coincidental.”