It's really wierd.
I love that movie, and I recently watched it again. But after a year or so passes, I know I'll think back and say: "yeah, that movie was 'aight" Then I'll watch it again and remember how funny it really is. I don't know why it doesn't stay with me. Maybe there are just too many awesome parts of that movie.
For a real treat, watch "Fail Safe" first, then "Dr. Strangelove" one after the other.
-Sik