[rightwingcrazy]

They used to put bells inside coffins.

[Ancesthntr]

“They used to put bells inside coffins.”
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Actually, there was a string or rope placed in the coffin, connected to a bell outside where someone could hear it…which is the origin of the term, “dead ringer.” Also, the inability to know for sure is the origin of the wake - literally to see if the allegedly dead person wakes up.