Every mother is out working the list – the list of school supplies she has to buy her kid. Have a cute sounding kid read two lists: the actual one of things that must be bought for him or her to go back to school. Also have the kid read the list of things that can’t be taken into a Guns ‘n Roses concert. Edit the two lists together so every fourth item is from the GNR concert. Present it as the school supply list and then, when listeners stop when they hear that odd item, reveal the joke of what you’ve done.