My older sister says it's a bad idea to stick jellybeans up my nose. Why?

The nasal cavity is made up of two narrow passages that lead from the nostrils to the nasopharynx. In the nasal cavity, air is prepared for its journey into the lower airways and lungs. It is a sensitive space. Jellybeans (as well as other candies, nuts, and peas) are about the size of a child’s nostril, and when lodged inside might get stuck there, or travel too far backward to manually remove. It may take a special trip to a doctor to get any foreign objects removed. Your older sister (or brother) is right: don’t stick anything up your nose, ever.