If a sudden and unaccountable light is seen in a carpenter’s shop, it indicates that the carpenter will soon have to make a coffin.
Cape Breton.

If a sudden and unaccountable light is seen in a carpenter’s shop, it indicates that the carpenter will soon have to make a coffin.
Source: Current Superstitions (1896), entry 1171.
Fanny D. Bergen, editor.
Modern normalized navigation; the historical attribution above remains unchanged.