I used to be an extremely disorganized person.
Friends complained I was “flaky” because I was often a no-show--no excuse other than I simply forgot.
One of my German professors even had a running bit with the rest of the class whenever we had an off-campus excursion. It went a little something like, “Wo ist Rachel?” (“Where is Rachel”) to which the class would reply in unison, “Keine Ahnung!” (No idea!”)