David Cerny's Piss has two bronze sculptures peeing into an enclosure that is actually a map of the Cezch Republic. The stream of water writes quotes from famous Prague residents. Visitors can interrupt them by sending SMS messages from mobile phones to a number displayed next to the sculptures. The living statue then ‘writes’ the text of the message, before carrying on as before.
And for those of you interested in furthering your appreciation of this piece (ha!):
I believe that the images and writing posted here fall under the "fair use" section of the U.S. copyright law http://www.copyright.gov/title17/92chap1.html#107, as they are intended for educational purposes and are not in a medium that is of commercial nature.