Magic Tricks

Hmmm, this one is a little troubling. It goes over the usual questions about the spectator's actions (grabbing the wrong part of the cup) with the statement that "it never happens". I am suspect of the "never happens" part.
Another problem was when the magician states "if you know them well enough, let them sip the coffee". The whole premise of this trick was meeting someone for the first time to get them to hire you. How are you going to know them well enough if you are meeting for the first time?
Too many "ifs" involved here to feel confident about trying this without trying it hundreds of times.