You're macking a girl at the bar or the coffee shop and she mentions her boyfriend.
You immediately follow up with "Oh really? What is it like to be in the perfect relationship"
If she goes on about how perfect he is, it's just not in the cards for you. HOWEVER from my experience more times than not she'll say well its not the perfect relationship. *She lists Problem A with boyfriend* and you defend him. *She lists Problem B with boyfriend* you defend him again. You're creating an ideal Tension between you two and at the same time exposing the flaws with her boyfriend. I then end the conversation with giving her my number and saying something along the lines of "now the power is all in your hands"