Small tubs of ready-set jelly
that can be taken from the shop shelf and eaten straight away* without even passing near a refrigerator to stop it from becoming liquid.
It is one of the few things you can buy which has a name that sounds as if it should be a question. Grown-ups say to the kids: "Ready to eat jelly?" and the kids yell back, in unison: "You betchya!"
There's a snazzy advertising gimmick right there.
* But please, please, please: Don't forget to pay for it first.