I like to test their knowledge a bit more...
"Really? 1080p? What's that?"
"Wow! Can you elaborate on that some more?" (after getting a completely wrong explanation of 1080p)
"What player do I need to output 1080p if I get this?"
(more incorrect BS from sales guy)
"That's incredible. So, what other choices do I have for 1080p?"
(dude, you are a moron)
"So, what you are saying is that this product, has the first production HDMI boards that accept 1080p, and that despite NTSC being the format DVDs are produced in, that you have some special ones that are actually 1080p native, and that while Texas Instruments has only released 1080p using wobulation technologies, this set doesn't use that?"
No arguement at any point - just questions that may leave the sales person asking a lot more than what he came in with.
We were all clueless at one point.
I have had VERY good conversations with the guys in the Magnolia section who tend to just agree that there is a lot of good stuff from a lot of manufacturers and they only represent one small portion of the A/V game.