You can have a bit of fun with Bluetooth hearing aids as well. I was driving around with a co-worker in Southern California getting directions off my phone fed through my hearing aids.
Co-worker: I thought you'd never been here before. How do you know where we're going? You keep going and taking all these turns and exits!
Me: A voice in my head is directing me.
Co-worker: (wide eyed stare)
Co-worker: I thought you'd never been here before. How do you know where we're going? You keep going and taking all these turns and exits!
Me: A voice in my head is directing me.
Co-worker: (wide eyed stare)