Hehe, this is an interesting question. I have terrible self-discipline but I generally expect people (myself included) to not let anyone down if they can. If it's something for "the man" I couldn't give a shit ( sux) but if it's something for a friend that I said I would do I'll try my best to do it.
Not so much a I-will-always-do-what-you-expect but more a I-will-always-try-my-best.

On the other hand, irrationals suck at being reliable.