Quite possibly 1971's Duel, the first feature-length film Steven Spielberg directed. I'm also fond of 1990's The Dreamer of Oz, a biopic about Wizard of Oz creator L. Frank Baum, which starred John Ritter and Annette O'Toole; that may have been the first time I saw what else Ritter could do as an actor. By the way, both films were written by Richard Matheson, who wrote I Am Legend, The Incredible Shrinking Man and quite a lot of the original Twilight Zone.
I'll give one more answer and say that while I haven't seen it since its original airing, so I don't know whether or not it holds up, I really liked the fantasy miniseries The Tenth Kingdom. Here's slight blasphemy: I think it worked better than Shrek.
Day 06 - Favorite episode of your favorite TV show
I'll assume this means "current favorite." And as wrapped up in Lost I am right now, I'll go with that. Maybe the most recent emotional high point of Lost was the "zap Desmond and see what happens" episode. The near-drowning, the memories of love re: Penny, and a smiling Desmond prepared at the end to do really, really tough stuff... holy crap. Extra roller-coastery, that night, in a way that made me go DO IT TO ME.