Unfortunately, with quiz shows, you tend to realise that you still don't know the correct answer 30 years on!
I used to attend a pub quiz where the quiz master, Ron, cited Ron's rule. If he asked a question that he had used only a few weeks previously, Ron's rule stated that, if you didn't know the answer last time, you probably wouldn't know it this time either. It was true about 90% of the time. Once in a blue moon one team might get it right but it was rare and usually not because they remembered what the correct answer was but because they remembered the incorrect answer they gave last time and tried something else this time.
I watched a few episodes of Blockbusters recently and amazingly recognised all of the contestants and some of their antics, mascots etc. from the original airing of the shows in 1992.
A version of Blockbusters with adult contestants is coming to Challenge in 2012. This was previously tried by BBC Two for one season in 1997 and was hosted by Michael Aspel.