I loved this 2001 post by someone in Japan detailing the various fast-food burger chains there.
Sounds like Mos Burger is a biggie, and whoa, check out the photos of the different burgers offered. The buns look like rocks cut in half, though.
And so help me, whatever this dessert is, it appears to be layered Jello topped with bacon, kidney beans, seaweed and giant green olives. (I think it might be green-tea ice cream, but really, who knows?)