A 55-year-old man in Bangladesh arrived at the emergency room with severe abdominal pain that had started just five hours earlier. During the examination, his temperature and blood pressure were within normal ranges, but his heart rate was notably high at 110 beats per minute. The man explained that he had accidentally inserted an eel into his rectum the day before while wearing a lungi, a traditional loose garment worn in South Asia. He had hoped the eel would exit naturally and had not sought medical help immediately. An X-ray of the abdomen revealed a dark, eel-shaped shadow on the right side, along with a crescent-shaped gas shadow under the right part of the diaphragm. This finding suggested peritonitis, a serious inflammation of the peritoneum, the thin layer of tissue that lines the abdominal cavity. Peritonitis can be life-threatening if not treated quickly, as it can lead to severe infection and sepsis, a dangerous condition where the body's response to infection causes widespread inflammation. To manage the peritonitis and prevent septicemia, doctors administered intravenous antibiotics, fluids, and medications to protect the stomach lining. They then performed an emergency laparotomy, a surgical procedure involving an incision in the abdomen. The surgeons accessed the man’s sigmoid colon, the lower part of the large intestine, and successfully removed the eel, which was nearly 2.2 feet long and still alive. To prevent further infection and allow the damaged section of the colon to heal, the surgeons performed a sigmoid colostomy, redirecting waste through an opening in the abdomen. This case is considered extremely rare, as traumatic perforation of the intestine by foreign objects is uncommon. While foreign objects can sometimes be ingested or inserted intentionally, the penetration of the colon by a live fish is described as "unusual and scarcely documented." One similar case was previously reported in Hong Kong, where a 50-year-old man had intentionally inserted a live eel into his rectum to relieve constipation. The Bangladesh patient was discharged four days after the surgery and was reported to be symptom-free at the time of the report.