"I need a tutor who really understands precalculus."
"Hello, I can help with your precalculus needs."
"Okay, but do you *really* understand it."
"Er... yes?"
"Prove to me that you really understand it."
"Hmm... okay. Imagine a right triangle...."
"A right triangle? OMG! You're a genius! Tutor me! Tutor me, now, and forever!"
"
"

