Apparently Arnold Schwarzenegger has read the script for Shane Black's The Predator and declined a part in the film, because he didn't like the script. In an interview with Yahoo!, he said that:

"They asked me, and I read it, and I didn’t like it, whatever they offered. So I’m not going to do that, no. Except if there’s a chance that they rewrite it, or make it a more significant role. But the way it is now, no, I won’t do that." So it's uncertain whether he meant that the script was bad or that he wasn't happen with the amount of screen time he would receive."

Black responded to a fan on Twitter about it, saying that he hoped it wasn't the actual script. See tweet below.