I set up my bluetooth headset to work with my laptop today for skype.
I also set up my nexus one to play music on the TV through the dock (which, it turns out it does using bluetooth).
Imagine my surprise when my laptop suddenly started talking to me! It seemed that my laptop had connected to my phone and set itself up as a headset. It then automatically answered an incoming call and put it through the laptop's speakers (and microphone) without any sort of prompt!!!
On top of all that, disconnecting the laptop as a headset caused the phone to dial my Dad!!
I think I have it sorted now by completely disabling the laptops ability to be a headset. Hopefully my work phone is not involved in this conspiracy.