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You know red Solo cups - the kind we thought only existed in various US teen comedies?
Well, it turns out the lines on them aren't just part of the design - and people have only just started to realise.
They're actually measurement lines, to stop you from drinking too much.
The cup was actually invented by American inventor Robert Hulseman, who died in 2016, who decided that people should know exactly how much of a beverage they're about to drink.
Well, the first line from the bottom is 1oz, or the same amount as a shot. Even if you have a double, it gives you a bit of a guide doesn't it - all key when it comes to pacing yourself.
The next line is the equivalent of 5oz. This is supposed to be the line you fill it up to if you're drinking wine. In the UK, a small is 125ml and a medium is 175ml, with the 5oz line just over 142ml - so a very reasonable amount.
The next one is supposed to be a beer line - the 12oz line is equivalent to 340ml, just over half a pint. Great if you like to make sure you're not going too hard too early.
And after the new piece of information went viral in meme form this week, people are shocked to find out that these measurements have been right in their hands this whole time.
One social media user wrote: "No wonder we're rolling around after two drinks, we're putting alcohol up to the wine line."
Another said: "We be pouring in the vodka to the wine line loool."
A third replied: "Shhhhhhhhhh ffs.. don't be putting this kinda FYI stuff out there, just fill the goddamn cup already.
"Bartender: So that's a full 20oz of tequila?
"Me: Pass me the cup yo..."
And we can't talk about Solo cups without bringing up 37-year-old Len Martin from Louisiana, USA.
The out-of-work musician and serial prankster posted a video suggesting he'd stuck a cup to his face with Gorilla Glue an attempt to prove that Tessica Brown - the woman who used the adhesive instead of hairspray - was a liar.
Martin initially gained notoriety of his own thanks to the clip, but later came out to say the footage of him gluing a red solo cup to his upper lip was in fact staged.
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