Image: nicolasnova [Flickr]
Benoit Deseille and Benedetto Bufalino turned a phone booth into an aquarium as part of Fête des lumieres 2007 (Light Festival) in Lyon, France.
http://liftlab.com/think/nova/2007/12/10/aquarium-phone-booth/
Previously on Neatorama: Car Aquarium
More seriously if you go to Lyon for the light festival, you need to come early : it's awesome but it's crowded.
http://en.wikipedia.org/wiki/F%C3%AAte_des_Lumi%C3%A8res