My four-year-old daughter and I have been devouring YouTube clips of Mister Rogers' Neighborhood. We've been to the crayon factory (obviously), the dairy farm, and the place teddy bears get stuffed. We've seen people make pretzels and construction paper and toothpaste. Tonight we stumbled on episode 1468, which features a field trip to the set of The Incredible Hulk that aired in February 1980. And since somebody must be wondering, here's a link to the crayon video.