So, todo lists become a bit of intellectual masturbation in the sense of "oh I'm not putting this off, I'm definitely going to do it, since it's on my todo list!"
I have on my todo list (see the irony) to build a mobile todo list app where tasks will disappear if not finished in a while, along with some other bells and whistles (they'll all move to another screen where you can't remove them and they'll mock you for ever), mostly as an art piece on this exact phenomenon rather than a useful app.