There is more than one answer to this question because different areas seem to have adapted it to suit them. Answers are
1) Dead as a Dodo.
2) Dead as a Door nail.
3) Dead as Door knocker.
The quote "Rest, rest, perturbed spirit" is from William Shakespeare's play Hamlet. It is spoken by Gertrude, Hamlet's mother, after his father's ghost appears to her.
A quote which is incorporated within a sentence where it makes sense with the rest of the sentence.
The quote "rest, rest, perturbed spirit" is from William Shakespeare's play "Hamlet". It is spoken by Horatio as he bids farewell to the spirit of King Hamlet after it appears during the night watch.
That actually isn't the full quote. Here it is: "A life of leisure and a life of laziness are two things. There will be sleeping enough in the grave." - Benjamin Franklin It means that now is not a time to be lazy. You can rest when you're dead.
Hamlet
"If the horse is dead, get off it".
Mannix - 1967 To Quote a Dead Man 6-22 was released on: USA: 25 February 1973
If you are in the 'chapel of rest' then you will probably be dead. It is commonly found in the undertaker's mortuary - where the dead are kept before the funeral.
"Ladies and Gentlemen...I am not dead"
It's a quote from the movie "Hackers".
Either "So shall it be," or "So shall it be done."
The quote "Slay the dreamer" is the title of a song by the band Nevermore from their album "Dead Heart in a Dead World." The lyrics of the song discuss themes of despair, betrayal, and loss.