You may be attending some outdoor BBQs – and those BBQs will probably involve some beverages in red solo cups. Some of you seasoned solo-ers may know this, but if not, a TikToker named Lindsay Roggenbuck, known for her popular household hacks, has gone viral for letting everyone else know. You know those lines outside the cup? They are actually measurements for beverages. The top line is equivalent to a pint of beer. The line below it holds a standard 12-ounce bottle or can. The second-to-last line measures 5 ounces, a typical serving of wine. And the very last line on the cup is 1 ounce – for shots.