Aka Manto (Red Cape) is a Japanese urban legend about a malicious spirit who haunts public and school toilets, who will ask you if you want red paper or blue paper. In some versions, he will ask you if you want a red or blue cape. Often described as a beautiful man in life and hounded constantly by admirers, he now wears a mask to hide his face.
If you are sitting on the toilet (usually the last stall), a mysterious voice will ask you if you want red paper or blue paper. If you answer red paper, you will be sliced apart until your clothes are stained red. If you choose blue paper, you will be strangled until your face turns blue.
Any attempt to outsmart Aka Manto by asking for a different color will result in you being dragged to the Netherworld. The only correct answer is to say no paper and he will leave you alone.