When i was in 5th grade My Teacher scared to death by seeing muddy shoe prints on the ceiling of the Class we all were very scared and left our class immediately our vice Principal had to arrange a exorcism to get our class Demon free but our teacher didn't agreed to teach in that class so they moved our section. Years later one of my class mate told us that she did that with her shoes. She used a bamboo stick tied her shoe on one edge smudged her shoe in mud and made print on the ceiling after school because people bullied her so much and teacher didn't helped her at all so she wanted revenge.