Derren Brown goes even further sometimes. The cups and balls on his TV show feature emphasis on certain words: 'for' said a little louder and longer than other words to make someone pick number 4 etc. He never directly explains this as 'influence' but it is intended so a keen viewer will watch many times and come to the conclusion "Aha! Neuro linguistic programming! I've worked it out" and stop looking for the sleight of hand that actually does the trick.