I think it's very rare, as an actor, that you get to a script, or an idea of a script, and you go, "Oh, I just have to do that!" It fell into place very quickly.
My easiest judgment for a script is 'do I want to keep reading it?'
You'll read a script, and it'll grab me, or it won't.
You can tell if you're going to be into a script within the first five or ten pages - if I'm not completely engaged by page 20, I just have to give up on it.
There are definitely scripts I start reading, where it doesn't interest me. Maybe it'll be a good movie, but the character doesn't intrigue me.
Normally, when I read a script, I read 30 pages, and then go have a cup of tea and come back. And then, I read 20 pages and go make a phone call, and then go back to it.
I opened the script to the 'The Wall,' and 15 minutes later I was done with it, and I loved the movie and wanted to be part of it.
If the script grabs me and appeals to me, I'm really very keen to work on it.
I ensure that I read the entire script of each project that comes my way. In fact, it is the script alone that evokes my interest in any film.
If I put the script down more than once, there's a good chance that I probably don't want to play the part.
You read a lot of pilots during pilot season, and not all of them really grab you.