A 14-year-old boy of a private school in Perambalur district of Tamil Nadu was allegedly forced to drink his own urine by three teachers after he sought permission to go to toilet.Parents of the boy claimed that their son asked for permission to go to the toilet which the three teachers monitoring them refused initially.According to the complaint filed by his parents the boy kept on pestering the teachers when they asked him to urinate under the tree and drink it and later beat him up. Officials of the education department on Saturday visited the school to probe the matter.