So, on Thursday last week, a Twitter account called @TheTwoFairies posted a couple of mystifying tweets.
Tis almost the season for scarves and mulled wine, but we predict fun of the magical kind...
We wouldn't want to spoil the surprise, but trust us, you won't believe your own eyes.
Then people started getting gifts from them...
Thank you @thetwofairies !!! It's fabulous such a lovely gift, especially after this long hard week #FollowTheFairies
Thanks SO MUCH @thetwofairies! Night in alone tweeting into the void sorted! #FollowtheFairies
And then on Monday, a quite extraordinary thing happened.
Louise Jones, the headteacher of Landewednack CP School, told ITV News:
It's a big surprise. Our school is the most southerly in the country...so we never get snow. Some of the younger children have never seen snow but this is the real thing - you can even throw snow balls.
The children will come back from half term ready to start their winter project. Short of a trip to the North Pole this is the next best thing.
It was a pretty magical scene.
BuzzFeed News reached out to the group via their Twitter, and got this response:
We're turning dreams to reality, bringing happiness and wonder to a Cornwall community. But now my friend, we need to leave, out of sight. Follow us above the Tyne, we'll take flight.
And lo...
Thank you so much @thetwofairies ! Ward 34 were stunned &delighted with their gift.You are doing a truly lovely thing
Thank you so much @thetwofairies! Our hard working theatre crew are munching the cupcakes now :) #FollowTheFairies
But who were they? Well...all is revealed.
View this video on YouTube
Yep, as some reporters had pretty much guessed, it was Marks and Spencer. According to the Guardian:
Patrick Bousquet-Chavanne, Marks & Spencer's executive director of marketing and international, said the retailer was spending a similar amount to last year on its 2014 Christmas marketing campaign. But he said the money it spent on hiring David Gandy, Helena Bonham Carter and Rosie Huntington-Whiteley for last year's campaign had been switched to activity on social media such as Twitter, Facebook and Tumblr.