We had one that would look up at an open back door, then put his head back down and go back to sleep. Of course, he had been an absolute outdoor cat until that car . . .
At about the same time, a kitten we ended up with that had been raised indoors since the day he was born outside in the 100F heat was insistent on outside whenever he could manage–bolting for cracked doors, etc. We had to lock him in the laundry room for a couple of days (I forget why. Peeing on the carpet, maybe??/)l, and he broke the screen on our fairly new double-pane windows to get out. We never saw him again (and had no real hope to, as he had a habit of sitting in the middle of the street when he got out . . .)
hawk