What are some good playful, funny comebacks when a woman says she has a boyfriend?

Anonymous
There's a woman I see in the hallway at work and we've flirted/chatted briefly a couple times the past month (It's a large office with thousands of people so we don't actually work together). I've finally decided to stop being a wuss and to ask her out. I'm pretty sure she has a boyfriend because I was a bit of a stalker and looked at her Facebook page, but I still want to ask her out anyway for the practice and to put it out there so she'll know to come "just say hi" if it doesn't work out with him.

Just looking for examples of something funny, playful, and/or mysterious. For example:

Her: Sorry, I have a boyfriend.
Me: That's cool. When's the wedding?
Her: Uhh... I don't know.
Me: Ohh, so it's not serious then?
Her: It is!
Me: *smirk* Well if doesn't work out you let me know and we'll go have some fun. Have a great day Jen.

Anyone have some other good comebacks when a woman says she has a boyfriend?
What are some good playful, funny comebacks when a woman says she has a boyfriend?
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