In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
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In 2010, Gary Richmond was beaten into a coma. He woke up with amnesia and no memory of his wife of 20 years. Subsequently, he ended up falling in love with her all over again!
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Couples' personalities converge over time to make partners more and more similar.
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A Korean man called Lee Jin-gyu fell in love with his large, huggable pillow and married it.
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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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In 2012, a Chinese man named Xiao Fan had a dress made out of 9,999 red roses for his girlfriend and then proposed - 9 in China means forever
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When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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