Wow, it really does work with readily available scenarios:

• "Do you want to supersize it?"
• "Would you like a drink with that?"
• "Add the supplementary electronics plan for $13.97?"
• "Paper or plastic?"

(I try to remember to bring my own reusable bag.) Not sure about "Receipt with you or in the bag?"

A very simple fix that, as False_Solace points out, is perhaps mostly applicable for these types of buying situations. Reduce chance of error/regret while only marginally increasing the need to correct. Thanks for sharing!