Widescreen vs. Yokelvision
There are two ways movies are presented for viewing on TV:  widescreen, where you see the picture as the director framed it (which usually results in black bars at the top and bottom of the screen), and  pan-and-scan (or "fullscreen"), in which the image is cropped (i.e. "formatted to fit your screen").
I am trying to replace the terms "pan-and-scan" and "fullscreen" with the term Yokelvision in the public consciousness. I hope you'll help by working the new term into your speech as often as possible (but not so often that folks look at you funny). Why? Check out these images from Widescreen-o-rama:
Bladerunner in Widescreen
Bladerunner in Yokelvision
So buy your DVDs in widescreen! You'll be grateful when you buy that widescreen TV. Oh, try to get 'em anamorphic too (although if you've read this far I'm probably preachin' to the choir).
(The images above are rather shameless in not reflecting the fixed size of your TV screen and the resulting "wasted space" when watching widescreen. You caught me; I'm not above propaganda.)