What's the best anime film you have ever seen?

I got a film which I really like which I don't think is very well known. Has anyone heard of the film "Angel's Egg"?

That film is so weird and peculiar that I've never seen anything like it since. I don't think there will be another like it ever again. Either because it's too out there or because it just breaks too many rules in traditional storytelling.

Spirited Away , I still remember my parents renting it, long before I was even into anime, and watching it.

I'd have to say End of Evangelion takes top spot for me. Right under that is Spirited Away, Princess Mononoke, Howl's Moving Castle, or just anything Miyazaki/Ghibli.
Then, Evangelion 2.22, Paprika is pretty great and does some amazing stuff with it's animation.

Ookami Kodomo no Ame to Yuki
Shit made me cry a few times but it's an amazing film. I recommend anybody who hasn't seen it to watch it right now.

I've seen very few anime movies related to regular series, they just don't seem very appealing.
I'd say my favourite movies are definitely any made by Studio Ghibli.

I consider 5 Centimeters per Second a movie, it was pretty good as well. The first anime I ever watched was Air (the movie), which I also enjoyed.

Aureolus wrote

Spirited Away , I still remember my parents renting it, long before I was even into anime, and watching it.

This for me as well. Studio Ghibli films are great.

The Disappearance of Haruhi Suzumiya. I should add a disclaimer that I'm a total Haruhi fanboy, but damn that film is amazing. I think it's one of the greatest animated films of all time, definetly in the top five.

I have to say that The Girl who Leapt Through Time really struck a chord with me. I can watch that movie again and again and it still blows me away.

a month later

Highlander: The Search for Vengeance
It's a masterpiece.