There was a water tower near me i was only young. Maybe 5 or 6 and my parents where discussing the water tower and how a rat was found in it.
Being young i only heard the key words so i assumed it wasnt a water tower it was infact the tower where all the rats lived. As far as i was concerned it was where all rats come from in the entire world.
Funny how something so simple can become so complicated and odd once things gets taken out of context ;)