Jessie's cat, Warren, was strictly an indoor cat until he joined our household.  When he lived in an apartment building with Jessie in grad school, she would let him out into the hall sometimes, and he would get spooked and "knock" on the nearest door, seemingly not caring that it was the wrong door.  When he lived with her parents in Manley, he didn't get more than a few feet from the door before getting spooked and wanting back in.