Need a transparent Plexiglas plate. On it write toothpaste word FOCUS. Make a wave plate, and the audience will see that the letter Y in the word turned upside down. Wipe it with a cloth and write correctly. Another stroke, and once again turned upside down. To put unruly letter from the head to the feet, usmania plate again.
The secret is simple. Waving plate, you turn it and turn to the audience by the other party. The letters f, a, C, and retaining your view, what can be said about the letter U.