I've told you about some of her clever tricks before but I've discovered a new one.
If I get in the car on my own, the radio comes on; if there are two of us in the car, it doesn't.
It works out that, if you're on your own, you must want music to keep you company, but if you've a passenger their lively conversation will keep you entertained. At least that's my theory.
(Husband doesn't believe me and thinks it depends on whether the radio was on when you last drove the car, but it doesn't.)