Still not so strange where I live. My parents, especially my father, would leave his keys in the car. In fact, one car he rigged it with a toggle switch so all he had to do was flip the switch and push the starter! He drove that car for about 35 years that way.
More recently, my mother's Pilot was stolen from the driveway and my parents called me to let me know as I live nearby. I asked how they got it running and of course the reply was 'well, the keys were in the car'. Car was found out of gas, with all change from the change area missing and some taco bell bags. No damage what-so-ever. They just went for a joy-ride. When her car ran out of gas, they just walked down that street trying for other unlocked cars with keys. You guessed it, didn't have to go far. A person on that street reported their car stolen and the keys were left inside.