We report two complications of nasoenteral tubes. A nasogastric tube became knotted during gastric intubation in a patient with a small gastric remnant, created during gastric surgery for morbid obesity. A clogged Dobbhoff tube ruptured while it was being flushed manually with a syringe containing normal saline under great pressure. To retrieve the knotted tube, we grasped the distal knotted part visible in the oropharynx with forceps, pulled it out of the mouth, and cut it. To retrieve the broken tube, we snared the intragastric fragment at endoscopy. These case reports suggest that a small gastric remnant may be a risk factor for nasogastric tube coiling and knot formation and that flushing a clogged tube at high pressure may rupture it. To prevent these complications, a nasogastric tube should be carefully passed just into the stomach in a patient with a small gastric remnant, and a clogged feeding tube should be flushed with only moderate pressure. Failure to clear a blocked tube by flushing with normal saline at moderate pressure should lead to tube removal and not to use of excessive pressure.