I used these on several woman mostly at bars, " I bet two of what ever you drinking that my underwear is cuter than yours"
or " I'll bet a drink that legs are smother than yours" it didn't always work, but I got to see a lot pretty girls standing in front me showing me there panties, and I got to feel a lot of legs, I guess that sounds a little creepy these days but thirty years ago it actually worked, in fact THATS how I met my wife, but that's a story for another day.