"All other swindlers upon earth are nothing to the self-swindlers, and with such pretences did I cheat myself. Surely a curious thing. That I should innocently take a bad half-crown of somebody else's manufacture, is reasonable enough; but that I should knowingly reckon the spurious coin of my own make as good money! An obliging stranger, under pretence of compactly folding up my bank-notes for security's sake, abstracts the notes and gives me nut-shells; but what is his sleight of hand to mine, when I fold up my own nut-shells and pass them on myself as notes!"
~from Great Expectations by Charles Dickens~