[ZenGum]

And now, the runners up:

I need a seed for my pseudo-random number generator - could I have your phone number?
Ian Marshall, Palo Alto, California, US

Your universe or mine?
and
Hello, did you know that I've invented calorie-free chocolate, and I've got some back at my place?
Attracta Uí Bhroin, Dublin, Ireland

You're so sweet I am developing insulin resistance.
Alex Carlton, Bradford on Avon, Wiltshire, UK

What's a nice girl like you doing in a superposition like this?
Nigel Eaton, Hitchin, Hertfordshire, UK

Did you know that if oysters had no natural enemies, in 10 years the world would be 28 miles deep in oysters? (We married in 1968 and are still going strong.)
Michael Boddy, Binalong, New South Wales, Australia

Hello, I am Bob. You must be Alice. You haven't changed a bit!
J. H. Van Veen, Voorschoten, The Netherlands

As a quantum physicist, the moment I observed you I determined that we were heading to your place or mine.
and
Of all the bars, on all the planets where conditions support intelligent, bipedal, carbon-based life forms...
Yonatan Silver, Jerusalem, Israel

Hello, I'm Doctor Frankenstein - and I've got a monster!
Allan Whatling, St Mawgan, Cornwall, UK

I've got some francium back at my place.
and
You have a hyperfine structure.
Ilona Schofield and Caroline Riggs, Brighton, East Sussex, UK

Forget what they say about butterflies, I think that you could whip up a storm just by fluttering your eyelashes.
Justin Byrne, Dublin, Ireland

How can I know a hundred digits of pi, but not the 11 digits of your phone number?
Yuan Yang, Leeds, Yorkshire, UK

Looking at you, creationists may have a point after all.
Amy Fairbrother, Northcliff, South Africa