Some people are terrible liars. No matter the size of the falsehood, their manner and tone will infallibly expose them as the fraud they are. Malthis of Woodsman’s Dell was one of these people - until his brilliant mind concieved a solution…
Deep within the bowels of the perilous labyrinth, the fearless heroes come upon a grand, ornate chest. Eager for more plunder to line their pockets with, they heave up the lid - to find nothing. A red herring? Maybe not.
What about a 'criminal' society with distinct laws - for stealing, the larger the value of something stolen, the less punishment the courageous thief recieves (but must return it of course). For this pirates(?) caught petty thieves deserve to be punished harshly. If you take, you better take a lot.