You walk from one room to another to do something specific, but, once there, you forget why you made the trip. Before cursing your faulty powers of recollection, consider the possibility of a different (and scientifically documented) reason for the lapse: walking through doorways causes you to forget because the abrupt change in your physical surroundings redirects your attention to the new setting—and consequently from your purpose, which disrupts your memory of it.
