Your second example is the one I'm most familiar with. I say stuff like that often. It's got nothing to do with all the article's other reasons -- it's usually

Your second example is the one I'm most familiar with. I say stuff like that often. It's got nothing to do with all the article's other reasons -- it's usually just because my mind is racing faster than I can speak. Someone : "I thought you really wanted to use the paintbrush. Did you see the if there were any rollers?" Me (mental response): "No (I didn't want to use the paintbrush). Yes (I did see the rollers) but they looked bad". Me (actually said out loud): "No. Yes, but they looked bad"