A case of trans–anal Garden pipe high pressure water jet injury as a result of practical joke, that is, playful insufflation of high pressure water jet through the anal orifice resulting in sigmoid perforation is reported. The patient presented to emergency department 12 hours later with complains of severe pain abdomen and abdominal distention following insufflation of high pressure water jet through the anus. On examination, he had signs suggestive of perforation peritonitis and x–ray of abdomen showed gas under domes of diaphragm. In emergency exploratory laparotomy was performed which revealed a 2.5cms perforation in the sigmoid colon. Repair of perforation was done in two layers and a proximal protective loop sigmoid colostomy was made. Reversal of colostomy was done after 8 weeks. Patient when last seen at 6 months follow up was perfectly well.