I use this one all the time when I open a two or three set (this example is in an elevator).
PUA - Before this reaches the top I want your take on a very important topic. Who'd win a fight: ninjas? or pirates?
Hot Chick - lol that is the weirdest thing anyones asked me.
PUA - You'd rather I start with something boring, like the weather?
Hot Chick - No thats actually pretty creative...hmm lemme see."
PUA - Alright, you have about 8 seconds to answer before I reach my floor. 8...7...6... wow... you'd do horrible at who wants to be a millionare.
Hot Chick - (smiles or laughs)
PUA - Here's my floor, and your times up - enter your number (handing her my phone) and you can text me your answer (smile).
I have about a 70% success rate with this one.