So last week, Bruce Willis appeared in Second Life. Rather, an avatar made to resemble Bruce Willis appeared in Second Life, while Bruce Willis the actor spoke on the telephone, so his voice could then be encoded into an Internet audio stream, which was then, in turn, streamed into the SL location where the Bruce Willis avatar was sitting, so Bruce Willis' voice might emanate mysteriously all around his avatar. At no point (based on what I saw, at least) did Bruce Willis the person interact with Bruce Willis the avatar, in the sense of moving around in the world, chatting with Residents, building or scripting objects, playing Tringo, using a poseball, and so on.
So, ontological question of the day: did Bruce Willis appear in Second Life last week?
(Disclosure: the Bruce Willis avatar appearance was advertised on NWN.)