Ok...A buddy of mine and I are trying to come up with 25 memorable movie themes, but I'm drawing a blank.

We're looking for stuff that's primarily instrumental, but as soon as you hear it, you know what the theme song is. For example:

Star Wars

Raiders of the Lost Ark

The Godfather

Forrest Gump

2001: A Space Odyssey

Anyone have any suggestions for me? I feel like I'm drawing a complete blank after that. I want stuff that people hear a snippet and almost instantly know what it's from. :)