I forgot to schedule a haircut last week. I regularly forget my usernames and passwords. I've forgotten anniversaries, birthdays and promises.
If these confessions sound familiar, it's because we forget all the time. And when we notice we've forgotten, it usually means the thing we forgot was important. Forgetting in these cases is a failing and we naturally wish our memories were more complete. It's no wonder, then, that forgetting has a bad rap.