Leave the meter, take the pen in my book 
I’ve got to be honest, I’ve never hid what I have – but I normally saved that for the second or third date. Quick trip to the gents to shoot up (damn that sounds so Trainspotting doesn’t it?) and all is good.
No real stories, but when I first went out with my wife I used the above technique. On about the third date I told her, to which she replied “Oh, so is my dad.”