Also from CNN.com:
A Japanese teenager was forced by his teacher to write an apology in blood after dozing in the classroom, the school’s principal said on Monday.
The teacher later went to high school principal Hiroaki Dan and confessed what he had done, Dan told Reuters.
The teacher had apologized to the 17-year-old boy and his parents, Dan said, confirming a local media report of the incident, which happened last Thursday.
He said the boy was taken to the staff room of the school in Fukuoka City, southern Japan, after being caught asleep during a lesson. The 40-year-old male teacher handed the boy a box-cutter and paper and told him to write an apology in blood.
This link, and the one below, from Dave Barry’s Blog.