A loud, startling, authoritative knock usually used by law enforcement to announce their presence.
Hey easy with the cop knock Fred, my kid is trying to sleep.
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A hypothetical situation in which contact is made with someone or something improbable (e.g. Aliens) through text message via cell phone.
I can't believe the way we make contact with alien life is by text contact." Fred said as he paced the room, "By a tween from New Jersey no less."