The first book of the three-part erotic trilogy was so successful, it sold more than 125 million copies across the globe.
And then, in 2015, Jamie Dornan donned a suit while Dakota Johnson donned a pair of handcuffs for the film adaptation. It raked in more than £60million in the opening weekend alone.
Everyone was talking it about all over again.
But you have to admit, things have been a little quiet on the Fifty Shades-hype front recently.
Bizarrely, it seems people might finally have stopped raving about the franchise.
Now, an Oxfam charity bookshop in Swansea have had to resort to begging (not in an S&M role play kind of way) people to stop donating the books.
They've had "hundreds" of used copies returned. So many, that they've managed to build an entire fort out of them.
Shop owner Phil Broadhurst told The Metro: "We appreciate all the donations, but less Fifty Shades and more Sixties and Seventies vinyl would be good.
"There are a lot of people obsessed by Fifty Shades of Grey. We get people bringing in new copies coming in all the time. Enough is enough."
So it seems the tides have turned (until the next film is released, anyway).
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