At my school, the Year 13/Sixth formers can all do anything they want on their last day at school. We call it muck-up day. Every muck-up day has a theme. This time, it was Harry Potter.
There was a tree with a sign on it saying “Danger — Womping willow!”
There were spiders all over the place.
People were dressed up.
The computer logon screens and desktops were Potterfied.
The teachers were given awards for being like a certain character (the most strict one being Snape and the one most likely to try world domination being Voldemort, etc.)
There were graves in the entrance hall that belonged all the characters that died in Harry Potter. One read “Dobby — A free elf” with a little sock above it and I literally died of feels.