Life in the 1500's (part 1)

I don't know if this stuff is true or not, but it makes for good reading.

Life in the 1500's ...

England is old and small and the local folks started running out of
places to bury people. So they would dig up coffins and would take the
bones to a "bone-house" and reuse the grave. When reopening these
coffins, 1 out of 25 coffins were found to have scratch marks on the
inside and they realized they had been burying people alive. So they
would tie a string on the wrist of the corpse, lead it through the
coffin and up through the ground and tie it to a bell. Someone would
have to sit out in the graveyard all night (the "graveyard shift") to
listen for the bell; thus, someone could be "saved by the bell" or was
considered a "dead ringer."