The quiz was called 'Double Or Drop', and remember that even though we were nothing like as sophisticated as children in the 60's, we still knew that Peter Glaze was the second un-funniest man on TV - first place in perpetuity, to Reg Varney.
Still have Crackerjack moments in supermarket when I only want one thing so don't bother with a basket and then collect more and more until I drop something !!
Just had to respond. I remember when Crackerjack was essential viewing, as for the double or drop game, i still recall a girl being asked, 'Captain Cook made three voyages around the world, on which one did he die' ?.
She replied, 'The SECOND one'. Still makes me smile 40 years on. Give her a cabbage.