Dr. Nick's Bonus Eruptus

We find Homer falling ill and he rushes to the bathroom to vomit. We discover that every bathroom in the house is occupied by another Simpson member with the same symptoms. The next day the family visits Dr. Nick and he says that they have Bonus Eruptus, where the skeleton erupts from the mouth and runs away. Marge ignores the diagnosis and thinks Dr. Nick is crazy so she decides to get a second opinion. Shortly after we find out that Bonus Eruptus is real, the Simpson family's skeleton escape their bodies and run off.