I find myself indexing the steering wheel while driving... just noticed that today - shooting grip on the 'spoke' and finger indexed along the horn.
Won't look down the muzzle if the action is closed (generally speaking). Always open the action upon picking a gun up - whether it's got a loaded chamber indicator or no. As for pointing it at anything I don't want to destroy, I don't point it at people unless they're on the television set - and that's my first target for dry fire (after dropping mag, cycling slide two or three times, locking back slide and checking magwell and barrel for explosive surprises).
More forgiving of my fellow man/woman/idiot's gun handling, though. If they shoot me, I will sue. If I die, I will haunt them, and write the four rules in ectoplasm on their bathroom mirrors.