This is how the trend looks like amused, tormented, irritated and confused many in recent times:
Photo: Facsimile Instagram
So, with the help of SVT News' followers on Instagram, we decided to solve the big glum mystery once and for all.
It was an applicant who took us to Kanye West, an American tweet - and to diesel prices and a hungry Swedish bird.
What is really behind the strange trend?
See the answer (?) To the glum riddle in the video above!