Expert Level Trick

Place the small piece into the large piece's groove. Next (it's best to tape the large piece's groove) slide the small piece upwards. Write down one thing that is beneficial to you and one that is detrimental to you. Then slide it downwards, and in the opposite way (A and B reversed), write down what's beneficial and detrimental to you. Next, find your intended target. If what she says is exactly beneficial to you, then that's great. If it's detrimental to you, then let it fall downwards. Enjoy scamming and making money.