Sounds fishy

Assuming the following story is true, I'm not exactly sure how it's physically possible:

A tiny fish found its way into a teenage boy's body in Britain by traveling up the teen's penis into his urethra, doctors say.

[...]

The medical experts, who treated the boy for complaints of pain and urinary retention, said in a paper that the young man made the regrettable mistake of urinating while holding the tiny fish.

"While he was cleaning the fish tank in his house, he was holding a fish in his hand and went to the toilet for passing urine," they wrote.

"When he was passing urine, the fish slipped from his hand and entered his urethra and then he developed all these symptoms."

Now, there are a lot of aspects of this that don't really add up. First of all, even if he really, really had to take a leak, why would you take the fish with him into the bathroom in his hand, instead of putting it into some kind of a container with some water? And how does a fish simply "slip" from one's hand and into one's urethra?

No, I think it's a little more likely that maybe we're dealing with a creepy little weirdo who got curious about what it would feel like to stick a fish up his pee-hole and then developed a serious (and understandable) case of buyer's remorse. Then, he concocted a story about what had happened to spare himself the embarrassment of admitting to the doctors that he's a...fishophile, I guess.

Update: While this story sounds outlandish, it should be noted that it's not completely unheard of for a fish to swim up someone's junk, though it's doubtful that anybody would keep one of these nasty little fuckers as a pet. The article said the fish in question was a betta.