Depends how frazzled I am, and how little patience I have. But yes I have and I don't see a problem with it. However, if I do open something it's too keep the kids amused rather than the fact that they've asked for something.
THe definition of stealing at law must include the intent to permanently deprive - so to use something without any intent to pay for something. It's not stealing if you have intent to pay for it. I have more issue with people 'testing' the grapes and other produce by sampling them by the bunch