This is an actual train of thought I had just now.
"Oh, it's getting late. I'd better start supper. Huh... I haven't been too hungry lately. That's weird. Wait... Didn't I just polish off a bottle of Mountain Dew, and before that a bunch of Cheez-Its, and before that a big bowl of leftover goulash? Man, I'm an idiot; I should post it on the internet! ... Why is it that I know this is a bad idea, but will still do it anyway?"
And I wonder why I'm not losing weight as fast as I'd like...