There is a melting face on my TV

Does anyone else find that, when they’re watching DVDs, they get a weird melting-face effect? It’s hard to describe – it’s as if when somebody’s face moves, their eyes go first and the rest of their face takes a second to catch up. It’s particularly noticeable in close-up, especially in scenes where the background is dark, and it turns absolutely everything into Jacob’s Ladder.

It’s really disconcerting and I’ve been getting it on different TVs, different DVD players and different discs/series. Anybody know what it is and better still, what causes it? Overzealous noise reduction? Weird DVD encoding? Something completely different?