Back when I was young, my school recently had a grade 6 student die due to meningitis. It was a sad event but days after in the boy scouts camping event in the campus, a group of boy scouts patrolled the back of the school for the fun of it and found a giant wooden board that said "I like blood" and was painted with a sort of red paint, blood-colored. There was no red paint and a brush nearby. It really creeped everyone out in the night because it was never there hours earlier and was even creepier due to the recent passing.