Growing up, I was absolutely awful at remembering things. My parents would ask me to do something and then get really mad when I didn't get to it, but I never did it on purpose.
Okay, usually didn't do it on purpose; I was still a dumb kid sometimes. Still, nine times out of ten, it would simply be that when dad asked, "Can you feed the cats when you finish your homework?" I forgot almost as soon as I replied with a "yes".