I'm going with the alien theory...it is much funnier than the 'real' story...which is probably that some jealous neighbour got annoyed at all the fun that was happening and put a stop to it with a syphon and a pin..
http://hosted.ap.org/dynamic/stories/O/ODD_POOL_STOLEN?SITE=FLTAM&SECTION=US
PATERSON, N.J. (AP) -- Daisy Valdivia is annoyed that someone stole her backyard pool - and baffled at how they did it without leaving behind a splash, drip or trace of the 1,000 gallons of water it contained.