Crooked Penny

Crooked Penny is an unlockable activated item added in The Binding of Isaac: Afterbirth †.

Effect

 * Upon use, has a 50% chance to double all items, pickups, and chests in the current room.
 * If the effect fails, the items, pickups, and chests disappear, and a penny is spawned.

Synergies
See Diplopia for info about stacking duplicate items.
 * : Void's item-absorbing effect activates before Crooked Penny's effect, but Crooked Penny nonetheless has a chance of doubling the absorbed items, leaving behind copies of them. Missing with Crooked Penny still results in the item being absorbed, but one penny also appears.

Interactions

 * : Activates the item twice, quadrupling all items/drops in the room at a 25% chance. However, if the first activation fails, and the second activation succeeds, a copy of the item will be created as the original disappears, and the new copy will have no cost if it were in a Shop or Devil Room. This has a 25% chance as well, leaving the overall failure chance at 50% (a success followed by a fail will have the same effect as two fails).
 * A failure followed by a success generates 2 pennies instead of a copy of the original items.

Trivia

 * This item's effect, if the coin flip succeeds, is almost identical to 's.
 * can be copied by this item.
 * Before Booster Pack #1, it could be used on empty item pedestals to cause another item to appear.