Candiru Catfish & Penises

So as I'm getting my Grey's Anatomy fix on Netflix, they mention something so absurd I had to Google it.

McSteamy and Burke reviewing an X-ray revealing the candiru catfish lodged into the patient's urethra.

From River Monsters: Candiru Catfish:

The Candiru is the star of an urban legend — which turns out to be true — of a man who was urinating in the Amazon River when a 6-inch Candiru swam up his urine stream into his penis. The fish remained there for days, until a surgeon was able to remove it.