I'll begin with one of my earliest memories of being well and truly wigged. Not a movie, but a scene.
Oh, yes. The psychedelic boat ride from the original Willy Wonka and the Chocolate Factory. I love this movie a good bit. Both of them, actually. Any film that acknowledges and revels in the fact that some kids can be just as intolerable and off-putting as adults, and then punishes them for it, is perfectly fine by me. But this part? I've seen it exactly once, because I can't bear to watch it again, and yet I can recall images from the sequence (the chicken and worm come to mind) as easily as if it were playing on a constant loop on my TV. Which it is. In my own personal hell.