I try sitting away from any entrances with my back to a wall, and getting a look at everyone entering the room I am in.
As for movie theaters, the one I goto only has one entrance and one exit (both in my forward arc of view). I sit where I get the best view of the picture, which is not tactically sound, but it's a compromise I choose to make.
Unfortunately, my job prevents me from egressing prior to contact.
Live at Yellow, Die at White--The Guru
Member: Orange Gunsite Family, NRA--Life, Varmint Hunters' Assn., ARTCA, American Legion, & South Cuyahoga Sportsmen's Assn.
"Gunnery, gunnery, gunnery...all else is twaddle!" --Admiral Sir John Fisher, RN