You've heard of a carpool, right? Well, we guarantee you've never heard of one like this before.

Last weekend, police in Germany pulled over a BMW after they noticed something very, very strange about it. Specifically, they noticed that it had a custom swimming pool built into the top of it. That's right. A swimming pool. The car—which is obviously not street legal—was pulled over after police noticed several men swimming inside of the pool. The men, who police believe may have been drunk, scattered immediately when they saw police lights behind them. But the driver of the car returned to the scene later to retrieve his clothes and was arrested for suspicion of drunk driving and driving an uninsured and unregistered car.

"I saw the strangest-looking convertible I have ever seen," one of the arresting officers said a short time later.

You can say that again. WTF were these guys thinking trying to drive this thing down the street?

RELATED: 10 Awesome Vehicles Converted to Swimming Pools and Hot Tubs

RELATED: The Wildest Custom Cars of 2013 (So Far)

[via Metro]