['I went to the store the other day and made a mistake.', "The sounds like it might be bad... What was the mistake? Maybe you're overthinking it!", 'I left with some candy that I forgot to pay for.']
Oh, that? That's big deal. Everyone has done that at least once. You're definitely overthinking it. People make mistakes. What kind of candy bar was it?
I went to the store the other day and left without paying for some candy.