"Everyone Does It"
Entering a nearby Supersol, Yossi made his way over to the open table containing candy and garinim. He reached his hand over and scooped up a handful and put them in his mouth to snack on while he picked up a few items his wife had asked him to bring home. Before paying for the items at the check-out counter he made one more trip over to the open table for another handful of candy.
Pay for the garinim or the few candies he had eaten?
Everyone does it - everyone helps themselves to a handful or two. It can't be considered stealing. It is only stealing when you take one of the items on the shelf that actually has a price affixed to its packaging.
A few blocks away David opens his Me'am Lo'ez to review the parsha and reads the commentary to Bereishis 6:13 about the generation of Noach:
In many cases, this crime took very subtle forms. A farmer would bring a load of fruit to the market to sell it and make a small profit. The corrupt citizens would find ways to eat all the food without paying. Each one would behave as a customer; while he and the farmer were haggling over the price, he would begin nibbling on the fruit. Once he had eaten his fill, he would find some excuse not to buy anything. He would complain that the fruit was no good, or that the price was not right; even if he paid, he would do so with worthless counterfeit money. This was an extremely common practice. If the farmed tried to collect for the fruit that had been eaten, the other would reply, "I was only tasting your merchandise to see if it was good. Everyone does it."
David pauses for a second and reminds himself of the incredibly high standard that the Torah sets for us with the prohibition of Lo Signov.