How could a smile be so deceiving? Well apparently it can, according to this new video from In59Seconds.
The video, which shows how to sniff out a fake smile tests your ability to spot a facial expression that isn't so real - and we don't mean to brag, but we got full marks on the test.
Dr Richard Wiseman, from University of Hertfordshire, looks at the sure signs behind a 'real' smile, including the formation of those cute little eye crinkles that appear when you're beaming from ear to ear.
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So, if you're feeling like your Sherlock skills are on form then watch the video, spot the signs of a fake smiler and let us know how you did!
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