What's up your nose?

Via the Consumerist,
Isaak was sick for three years with terrible sinus problems from ages 3 to six.  The doctors assumed that it was bacterial and prescribed antibiotic after antibiotic but this never solved the problem.

Then one physician looked outside of the box (outside of the nostril?) a bit and noticed that there was some kind of foreign object up the child's nose. Did [Isaak] remember putting anything up there? ["I put some spaghetti up there, but that was a long time ago," Isaak told the doctor.]  A specialist removed the obstruction, which turned out to be a "ball of fungus" surrounding a tiny, flexible LEGO tire. The child's health problems abruptly disappeared.

According to Isaak's dad , "I asked him, ‘Dude, how did that even get in there? We think he bent it in half — it's pretty flexible — and that it opened up once it got into his sinuses."