It will prove unlucky if you return for a forgotten article after you have left the house; but if you seat yourself before leaving the house again, the misfortune will be averted.
New York.

It will prove unlucky if you return for a forgotten article after you have left the house; but if you seat yourself before leaving the house again, the misfortune will be averted.
Source: Current Superstitions (1896), entry 658.
Fanny D. Bergen, editor.
Modern normalized navigation; the historical attribution above remains unchanged.