Yeah, I almost feel compelled to follow any salesperson I see at one of those stores who's helping an affable but uninformed person just so that I can correct all the false statements they're told after the salesperson goes away. It's amazing to me that people hire most of those people to represent their stores and companies. Most big box retail electronics stores are really shoddy shopping experiences.
* "More expensive HDMI cables produce a better quality image"
* "Higher megapixel cameras produce higher quality pictures"
Etc. Those are the ones I came up with off the top of my head that I was personally enlightened with at one point or another.