Why is it when I watch some programming in HD, (ESPN) for example, sometimes there are bars on the side that say HD in them and some shows take the full screen from right to left? I hit the aspect button to take away the bars on top and bottom but it stretches the people and they look funny. My tv isn't a widescreen, it's the typical shape. It's just weird that some shows will play full screen, some with bars on top and bottom and some with bars on left and right. Anybody?