Sam Ballard, then 19, ate a garden slug at a 2010 party that everyone at first thought was harmless, but later caused the teen to become paralyzed and unable to communicate or care for himself, the Herald Sun reports.
The slug carried a rare infection called angiostrongyliasis, also known as rat lungworm. Slugs acquire the parasite when they ingest feces from already-infected rats, the CDC reports.
The agency even notes that some "have gotten infected by swallowing snails/slugs 'on a dare.'"
The infection caused Ballard to fall into a coma for over a year, according to the Herald Sun.