About a year ago, PAX sought to ban booth babes (pardon me, "costumed booth representatives,") using a number of tests to determine booth babe-iness (as opposed to garden-variety sexy cosplay). One of them was a lack of familiarity with the product represented.
At E3, Bitmob's 5HP put that standard to the test with a five-question exam of nine booth representatives, one of whom said she worked for GameStop as recently as last year. These aren't trick questions. You know all of the answers, and they don't.