good idea, except...
Unfortunately - for those of us who enjoy raspberry jam - you couldn't find any in the shops since it would be one more hoarded item.
Also, us legit buyers would need to don at least sunglasses and fake beard (or just Groucho glasses) before approaching the jam shelf. One might as well buy a whole 6-pack of toilet paper since you're already camouflaged.
Biting the hand that feeds IT
