I used to leave my keys in the car overnight. It saved having to dig for them in my purse. And then there came the day that the car locked itself with the keys inside. Husband and I used a pry bar and a chisel to open the corner of the door enough that he could stick a wooden dowel down to the lock button and release it. I began to keep my keys in my purse. It isn't a big purse, but whether it's the weight of the keys or my general rummaging, the keys never are where I expect them to be. I head for the door, think "keys," stop, dig around, go back to the kitchen counter to put down everything in my hands and dig like a maddened squirrel until I find the things. I'm likely to remove items (wallet, checkbook) in order to plumb the depths, and to go on my way, keys in hand, funds on the counter.
Now that the weather's cold overnight and the car's in the barn on a regular basis, I've taken to leaving the car window open and the keys in the cupholder. So handy, and if the car decides to lock itself I can reach in, punch that button, and thwart the vehicle's efforts to keep me out.
As the weather gets even colder I won't want the bitter damp winter wind permeating the upholstery. I might take to throwing the keys on the floor of the barn. I just hate having to dig around for those keys. Every single time I do it, I think maybe this time they've been swallowed up into a fourth dimension and I'll never be able to get into the car or the office again.
Then I would have to stay home all the time.
Maybe I have something there.