This film explains how you can beat the odds by counting cards in blackjack. It's entirely silent so you have to look at the on-screen text. You'll see the whole deck laid out in rank - ace down to two - and suit - spades, diamonds, hearts and clubs. Partway through the video the words 'if you look carefully' come up faintly on the screen. Then they disappear again, leaving you with a view of all the cards laid out as before. It may be difficult to see from this exactly what the presenter intended you to do. The message is not clear.