I had just bought a Camry Hybrid and my wife and I were driving in it doing errands... I have a tell when something is on my mind and my wife invariably asks what it is. Usually it really isn't anything significant and that time was no different...
Except....
I launched into a very detailed explanation as to how the Toyota Hybrid Synergy system really works and it lasted till we got home... Did I mention we had three stops and we're on our way to the first?
She has not asked what is on my mind since.