Yep, been there.
Was walking back from class a month or so ago, a good distance behind a particularly wonderful female specimen. The first sign something was odd was when I thought to myself, "she's gotta be at least d20 away, time to kick in WEP." The whole time i'm WEPping, I'm thinking "Gotta stay on this one's six." Followed her for quite a while (in my defense, we were actually going in the same direction). She went around a bend in the sidewalk. AHA!!! Lead pursuit! Time to close the range a bit. Now I'm thinking, Ha, snuck up right on her six, got the range perfect now.
Next she gets to a turn in the sidewalk, and I again I'm pulling lead. But then, she suddenly stops. Chop throttle!!! Chop throttle!!! Don't midair! You're going to overshoot! I can't just stop in the middle of the sidewalk and look like a weirdo trying to check out the girl's ass, so my next instinct is a high yoyo. No go, I can't go up. So it's lag pursuit time.
I swing the turn real wide, in somewhat clumsy lag pursuit, and we both stop at the crosswalk. She turns around and gives me one of those little half smiles.
I pretend I didn't notice. I'm an idiot.
Needless to say, she had a very nice six.