['While getting into my car after shopping, I realized I had walked out without paying for the flash drive I had picked up.', 'Oh no, did you return to the store and pay?', "I didn't, I really didn't want to walk all the way back to the store. I know... I do feel pretty bad about it."]
Maybe you should go ahead and do it?
I walked out of a store without paying for an item and couldn't be bothered to go back in to return it.