Okay, I won't take credit entirely for this because I think I saw a guy on a youtube video say something similar but I added my own touches.

Normally at a bar or club, there are a bunch of guys around the dancefloor or just lurking around looking creepy.

Me: Hey, we need to play a game? See those random creepy guys? *point*
Her: Yeah, haha.
Me: Well, it looks like they need some love.
Her: *Blows them a kiss*
Me: Awesome! Haha. One more question: are you single?
Her: Yes *sheepishly - puppy dog eyes*
Me: Perfect! I'm sure one of those guys would make a great boyfriend for you tonight!

Bam. She thinks I'm interested - then she gets a mixed message, I got her status, and then I turned it into a push-pull situation. It ended up working perfectly.

another one I like is to use an awesome little neg that I wish i could take credit for but I cant... "Oh my God! How does your boyfriend deal with you?!" She will either answer that she doesnt have one or she will answer and giggle.

If you're worried about her thinking you're into her, stick with corps' line.

It can be anything really.

"Boyfriend thought he was too cool to hang with ya tonight?"