Sometimes the truth really is stranger than humorous fiction – according to a post from national media source:

BBC predicts a light fall of the white stuff, in Hull, today.
On 27th March (note date: not posted 1st April), Hull Daily Mail posted this story, inviting people to gather at 11 am for the third annual pillow fight.
I came across this story today on the BBC news page, as something which looks like an April Fool – but isn’t. And the BBC should know – last year, the pillow melee took place outside their offices. The tradition is remiscent of a scene from old black and white film comedy days – a piano plays, around 200 people turn up and hit each other with pillows until they get tired (around 20 mins) then sweep up the feathers.
Comedy ensues.