Oh no! I'm sorry. Looking back at my list, I guess most of it IS on the dark side. I mean, Bergman is unavoidably dark and people joke about Herzog's bitter nihlism, but I didn't mean be a downer, I hope I didn't ruin any evenings. I cry uncontrollably at Kes, but I also love it. 400 Blows is equally depressing, but Kes is closer to my heart (professional critics will tell you 400 Blows is a more important film). Ring of Bright Water is a somewhat lighter take on animal bonding and loss about a man and his otter but it is only a so-so film.
You will notice The Princess Bride got recommended repeatedly, That is a happier, family friendly film that is sure to put a person in a better mood. Some Terry Gilliam is lighter, but save Brazil for when you're once again ready for 'grim' (great flick, though -- and you could theoretically ignore the intended ending by picking an alternate cut).