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WATCH: Can you work out this impossible cup optical illusion?

If you pride yourself on figuring out tricks or busting someone’s sleight of hand, you need to check out this cup illusion that has the internet totally baffled.

The video, which was shared on Twitter by user franco_713, shows a line-up of three different sized cups from US fast food chain Jack in the Box.

Liquid is poured from the smallest cup into the medium sized one. Photo: Twitter
Liquid is poured from the smallest cup into the medium sized one. Photo: Twitter

Liquid is poured from the smallest cup into the medium sized cup, and appears to fill it almost to the brim.

The medium sized cup is then poured into the large cup with the same result.

Hey presto, it fills it perfectly to the brim - despite the two different sized cups. Photo: Twitter
Hey presto, it fills it perfectly to the brim - despite the two different sized cups. Photo: Twitter
The exact same happens when the liquid is poured into the biggest cup. Photo: Twitter
The exact same happens when the liquid is poured into the biggest cup. Photo: Twitter

So what gives? Twitter is having a field day trying to figure out how three different cups can hold the same amount of soft drink, but some are pretty suspicious.

One Twitter user even recreated the experiment herself, and found she didn’t quite get the same results.

Eagle-eyed viewers also noticed an odd leakage during the first pour.

Watch the video above and see if you can figure it out.

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