My cats like boxes, just like Ted below, but they seem to be even more fond of taps. Dripping taps. Tristan has displayed this behaviour ever since we first got him (we think he was about 5 years old when he came to us), but Sally was a normal water bowl drinker when she arrived. For about half a day that is and then she was converted too! However, she hasn't progressed from the bathroom sink to the shower as Tristan has :-). Incidently, the only way to get Tristan to drink from his water bowl is to add chunks of ice- he is a truly American cat.
I apologise for the bad quality of the pictures- bathrooms are difficult when the flash is bad.