Rachel McAdams doesn't really hates cats, of course.
What she hates is lying. Especially about her. So when Splash Page recently asked her about the rumor going around that she'd auditioned for a role in SPIDER-MAN 4 as possibly the Black Cat aka Felicia Hardy, she was quick to say "Fuck you, assface!! You tell one more lie about me and I'll eat your pancreas! Got it, fucktard?!" At which point she proceeded to stab the interviewer to death with a nail file.
Clearly, she didn't really say that. What she really said was "That's a total rumor, I have to say. I was hanging out in Toronto the other day and someone came up to me and said, 'I just heard you're doing Spider-Man 4.' And I said, 'Really? No one told me! It's not true." The stabbing to death part is absolutely true, however. Really. Why do you think she's in Canada right now?
It's too bad, really, since she would have made a fine Black Cat but if she won't be donning some ridiculously tight black spandex, who do you think should? Blake Lively, maybe? Dianna Agron, perhaps?