David Cassidy died

dibbons said

... and when you called, someone answered the phone, if no one else, at least the mom at home cleaning, cooking meals, and changing diapers.

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And no sales calls. Calling someone back then was considered like knocking on their front door. You had to have a reason to call and it was always personal. The phone never rang after 10 pm unless it was urgent or an emergency. A ringing phone after midnight was always a reason to feel panic.