Here's a quick mentalism trick and the patter I use, although you should use your own voice so it doesn't sound scripted (note: this is NOT Mystery's number ESP routine):
You: do you believe in ESP/telepathy?
HB10: blah, blah...
You: I want to see if we can connect on another level, another type of communication if you will.
HB10: ok.
You: Close your eyes. (if the girl protests tell her she can keep her eyes open but only if she has a good imagination (subtle NEG)). I'm going to send a message to you now. It's an image, a simple geometric shape and I'm drawing it, nice and big on a blackboard. Can you see what I'm doing? Remember, you should only see what I'm doing not what your own mind produces. Our own minds tend to produce a square but I want you to only see the image in my mind. Now, I'm thinking of second shape, it's different though and I'm superimposing the two. Can you see what I'm doing in your mind?
HB10: yes.
You: If I'm sending it to you properly, you should be seeing a circle and a triangle.
*statistically, people tend to pick the circle and triangle when you don't give them the option of picking a square. There are some pros and cons to doing this trick:
pros: you can do it anywhere with anyone and anytime and with more than one person at a time. It builds rapport and trust with girl and you can even get Kino (hold her hands) under the pretext that you're developing a "connection."
cons: it doesn't always work especially when beginning and people try to be cute and pick a rectangle. It takes practice to get good with this one but once you do, it can be a very useful routine in your bag of tricks.