Question

How do you all feel about picking up a bag of some sort of foodstuff whilst shopping in a supermarket/large grocery store and opening it before you pay, wandering around the shop eating the contents?

I ask because it's something I see other people do sometimes, but I just couldn't ever imagine myself doing it. My brain says, "You haven't paid for it yet. It's not yours. You have no right to eat it."

Does anyone know how shops feel about this? I'd have thought they'd generally disapprove since they have no guarantee the eater won't change their mind before the checkout and just abandon an open, half-eaten packet in the soft drinks aisle or something.

Is this something you do/have done? Do you think it's OK, or not really?