Its an old trick. you go out to dinner with friends and have leftovers. You go to their house for dessert and so need to refrigerate the stuff so you leave your keys on top of your food in their fridge. No way to forget the stuff as you can't unlock the car and you need your keys.

Now along comes the fob. You do the same thing only she has a key fob in her purse. She gets to the car, opens her door which unlocks yours and sits down. She sits down in passenger seat and you get in to drive. You start car and drive home. Only your keys are still sitting on top of your food in friend's fridge.

So why not put both fobs in the fridge?

[kidding]Why not only order one appetizer and one entree (when you go out with "she") that the two of you can split.
No left overs. Leave the key in your pocket. After dessert, go home. Voila, no left overs! No forgotten keys...and if you're economically minded (and most hybrid owners have an interest in saving money), you save on the dinner tab.[/kidding]