You can't trust parents

Little boy: Dad, will you remember me tomorrow?
Dad: Of course.
Little boy: Will you remember me next week?
Dad: Yes.
Little boy: Next month?
Dad: Yup.
Little boy: Next year? Two years? Three years?
Dad. Yes, yes and yes.
Little boy: ...Knock, knock.
Dad: Who's there?
Little boy: Aw, man! You forgot me already!