Brian Brushwood's mind control magic trick

Here's Brian Brushwood showing how to do a great mentalism trick. The effect: Brian explains to the spectator that a psychologist once taught him about a famous Robert Frost poem that, when recited, will force the person who hears it to imagine a specific playing card. Brian then recites the poem to the spectator and asks the spectator what card he thought of. Then Brian tells the spectator to do a YouTube search on the psychologist who told Brian about it. The spectator plays the video and the psychologist says the same card the spectator thought of.