An internet phenomena where a computer links two people over IM - and gives each user false

It's similar to a three way call using AIM. Imagine someone mutes his own phone and then calls you. Then he calls someone else. Now you're talking to a stranger. Your phone rang and so did theirs. You think he called you and vice versa. Neither of you realize there's a third person instigating all this. This is basically the same thing, but with AIM.