Tokyo, holy excrements from small undefined creatures! We're there. First place we had on our list was Nakagin Tower.
Spending two whole days there, we finally learned the dread and discomfort of living in a capsule hotel. It was wonderful, apart from the occasional shakeup and earthquake panic you'd feel when your neighbour decides to move his capsule four floors up, at 5 AM. He was courteous enough to leave a box of chocolate with an apology to his neighbouring capsules.