Potential black mail material. Also you never know what such information can do. The Dutch government stored religious affiliation on personal records before ww2. That info was used by the Nazi's to locate their victims. You don't know who will own stored information at some point.
Encountered some tourists in Japan who were disappointed that the food there wasn't more like their home country (same country I'm from). I really don't understand why they would think that Japan had similar food as their place of origin. I even miss the Japanese food so much that I am currently trying to recreate the curry that I had there (still no success in recreating it).
Freaking love Japan in how clean the cities are and how polite everyone is. Only downside was that August is way too hot and I should have went during spring as I couldn't visit a couple of things due to the heat