high pitched sound

I don't really get this, but maybe it's because I'm old.

KFC has a commercial that features a high pitched sound (called a "Mosquito Tone") that only younger people can hear. This has been a growing trend as I heard a news story about stores that use the sound to keep kids away from hanging out in their stores that had a sound that only younger people can hear. The problem is, the high pitched sound is CLEAR AND LOUD, whether you're 8 or 80. Am I missing something?

Anyway, you can judge for yourself after the jump. I don't know if there's another sound in the clip that we older people don't hear, but I do suddenly have an incredible urge for a Boneless Variety Bucket.