Unforgettable weirdness

One of the weirdest horror films I've ever seen,feel like mixing of family drama-comedy with horror/sci-fi supernatural, it sometimes scary, sometimes hilarious, sometimes dramatic, sometimes ridiculous, sometimes silly, weird weird weird....
it's a horror film that almost looks like children film,and I don't know why...in the end , it's almost moves me to tear, I feel nostalgic-melancholic ... it was like a family dream (or american dream) collapsing in front of me.
It may look silly on the surface,but it is a heartbreaking theme inside.

===many memorable scenes that spectacular===

I consider it's a classic horror, not a kind of great film but a special and unique one.