At our house we have a running joke about the sham-wow. We've seen the presentation at the county fair, OC Marketplace, and - just recently- on the TV. It's amusing that the pitch is always the same... spill the diet coke, flip the carpet sample, etc. We haven't ever actually bought one though because the pitch and slick salesman routine is a bit icky. Not big fans of the hard sell.
On a related store I went to my first "As Seen on TV" stores in Solvang this summer. We hardly bought anything there but it was really cool seeing all those products in one place... the clapper, bedazzler, chia pets galore.