I've got an idea yesterday when i was taking a walk. It was a opener which was deminding something of her. So i made a couple of openers and they worked better than i could imagine!

Ask a girl directly: "who of us do you think can hold our breath for longest"
This worked really well not only did the girl give me huge smile back afterwards i had won she demanded rematch and i had the game going

another i figured out was to say to a girl: "which one of us can come fastest to the otherside of the sidewalk(adapt it to the environtment of course) on one leg"
these openers are totally unexpectet

even though i'm new in the game i think it could be nice with some respond

I like the idea of an opener to be demanding, being a dominant alpha male en DHV. Your examples may result in some weird looks though.