I watched it when it first came out and the ending shook me up for weeks, then forgetting I had seen it, I watched it about 15 years later and the ending shook me up for weeks.
Terry Gilliam (the only American in the Monty Python crew) did some really brilliant stuff, I've been ready to buy this one and watch it again. One of my favorite parts is how his mom gets younger in every scene. Brilliant.