If you want an example of bizarre then Google "Hello Kitty Toilet".
I have a photograph some where but can't find it.
A knowledge of the complex nature of Japanese toilet facilities would help in understanding just what it can do.
Regarding Japanese food. There is an excellent shop by Piccadilly Circus selling the most wonderful items including a vast range of Sake.
When I went to Japan I was told to ask for the Japanese menu on the flight as it was far superior to the European version.
You can now get Japanese Wagu beef in the UK. Expensive, but a cheaper version exists that uses an Aberdeen Angus Wagu cross breed. You can even buy the burgers in Aldi at certain times.
Bernard