You got away lightly: A friend of mine was due to give a speech of thanks to her Japanese hosts after a stint of teaching English when she made a trip to the bog. She pushed the wrong button, and the toilet retracted into the wall and a shower head soaked her to the skin. She had to give her speech with her silk blouse stuck to her skin.
Technology aside, the product designers Seymour and Powell revealed in the late nineties series 'Designs on your [toilet]' that the Japanese test the flushing system toilet in a more rigorous and sensible way than we do. UK toilets are tested with standard speheres, whereas the Japanese test the flush with hand-rolled foodstuffs to better simulate what the toilet will have to deal with in the real world.
It was also toilet design that led to Jony Ive leaving the UK for California:
'Tangerine had a consultancy contract with the bathroom-fittings company to design a toilet. I was there when Jony made an excellent presentation to this guy who was wearing a red nose because it was Comic Relief day. This clown then decided to throw his weight around and pulled apart Jony’s design. It was ridiculous. Britain lost Jony Ive then and there.’ - Clive Grinyer