Public string/cup telephone

 Wp-Content Uploads String-Can-Phonebooth-20080801-115730

This fantastic string telephone installation was spotted in Ann Arbor, Michigan. I wonder who was on the other end.
String telephone booth (Wooster Collective, via Laughing Squid)

UPDATE: In the comments, RUSHO18 writes, "There's another broken phone just around the corner that had a banana with googly eyes glued onto it hanging from a string. I got a picture of it off my cell phone, enjoy: banana phone"