Did you know that you were talking to a goldfish?

NYU’s Interactive Telecommunications Winter Show.

Among its favourites is Fish-byte.net, an installation, by Jason Babcock and Michael Kertesz, that uses computer vision technology to open a communication channel between the visitor and a live goldfish, capturing the behavior of one species and translating it to another.
The human is fooled into thinking that s/he is communicating via an LCD display with another person, only to find out, walks into the adjacent room, that it was a fish s/he was actually interacting with.

From We Make Money Not Art.