You must text a mobile phone message if you want to use the public toilets in Finland. I think this is kind of smart, but as someone with an aversion to cell phones, kind of irritating as well. It's supposed to crack down on vandalism, and I'm sure it would work too.

http://www.vagabondish.com/gotta-pee-finla...exting-toilets/

Authorities in Finland have cracked the secret to preventing vandalism in public toilets. Last month, the Finish Road Administration authorities put into place a system that allows travelers to access toilets by SMS text messaging the number given on the door of the public toilet.