Most of the stuff in this thread so far is stuff that I would say without even considering it creepy. That's kind of... worrying.
I had a genuinely creepy girlfriend who used to try to be as creepy as possible for fun.
Choice lines:
Her: "I want to skin you alive and then wear your skin so I'll be inside you."
Me: "But... I'd bleed to death. And... you'd suffocate."
Her: "AND THEN WE'LL BE TOGETHER FOREVER!"
Her: "If you don't have sex with me, I'm going to cut out my own vagina and send it to you."
Me: "You're just ripping off Van Gogh."
Me: "Want to try something new [sex-wise]?"
Her: "Why don't you cut me!"
Me: "What?"
Her: "I'll go get a knife."
Me: "Wait, wait! I'm not going to cut you with a knife while we're having sex!"
Her: "YOU NEVER WANT TO DO ANYTHING FUN!"
Man, I wish I was making this stuff up.
(In case you're wondering, she was actually really hot, too.)
Edit: I realise these aren't strictly compliments, but you could interpret those exchanges as complimentary by virtue of the fact that she was so obsessed with me. That's how I took it.