I discovered a new first world problem. I called a friend's mobile phone while he was at home and we were discussing things for ten minutes or so. Then his spouse arrived home from a trip to the store and parked the car inside their garage. My call ended suddenly and I was a bit confused.
Later, I found out that as the car entered the garage, my friend's mobile automatically connected to it via his stored Bluetooth profile. His spouse was suddenly hearing my half of the conversation on the car's stereo speakers. She panicked, and hit the call end button on the steering wheel.
It felt like one of the weirdest edge case technology problems possible.