This happened/happens to me a lot unless I 'm really attracted to the girl. The "counter-intuitive" thing is this raises interest like crazy and usually they'll come and throw themselves at me a week or so later. Weird. Or so I used to think...
She asks it casually, mid-sip. And you feel the floor open up, because the honest answer is work, gym, and a couple shows you're half-watching.
Women rarely say this out loud, but a man with a life is attractive before he says a word. The guy who spent Saturday deep-sea fishing and came back with photos and a story — he walks in already interesting.
The "22 Rules" pushed me to build a life worth talking about. Turns out the fastest way to be interesting to women is to be interested in your own life first.