I find Subliminal Advertising concept is creepy but interesting.
It felt like your unconscious mind is being hacked.Check the video out and let me know what you think. It’s bloody good documentary done by Derren Brown. Very interesting topic to be documented.

According to Wikipedia, A subliminal message is a signal or message embedded in another object, designed to pass below the normal limits of perception. These messages are indiscernible to the conscious mind, but are alleged to be perceptible to the subconscious or deeper mind: for example, an image transmitted so briefly that it is only perceived subconsciously, but not otherwise noticed. Subliminal techniques have occasionally been used in advertising and propaganda; the purpose, effectiveness and frequency of such techniques is debated.