Would-be revellers are using satellite images on the internet to find houses with swimming pools - and then turning up uninvited for an impromptu dip.
The craze involves using the Google Earth programme, which provides high-quality aerial photos of Britain and other countries.
Once a target is chosen, the organisers use social networking sites such as Facebook and Bebo to arrange to meet, say police.
Here is your dark future.
Google Earth goes to real-time live satellite images. Better than what was dramatized in Patriot Games.
And that nifty phone you have with Google's Android OS? The one with the GPS built-in?
It's tied into Google Real-Time Live Earth.
So your friends can find you.
But so can all the villains.
Thief One: Oi! That geek asshole finally left his crib.
Thief Two: Yeah. Keep tracking that eejit. Call me if he comes back while I'm in his place.
Thief One: Don't forget that fly PC we saw delivered yesterday!
Thief Two: Damn straight I won't!
You don't think it will happen?
Meantime, there's a good business to be had making camouflage pool covers ...