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Apple! is a passive item added in .
The Binding of Isaac: Afterbirth †
Adds a chance to fire razor blades that deal quadruple Isaac's tear damage.
The chance to fire a razor blade depends on the luck stat. At base luck (0), it is a 6.66% chance and goes up to 100% at 14 luck. +0.3 tears.
/ Cricket's Body / Compound Fracture : When razors are fired, the split tears will also be razors and do quadruple damage. The Parasite's split tears look like normal tears. The Parasite
: Adds a chance for bombs to do roughly double damage. Dr. Fetus
: Adds a chance to fire a giant razor that does roughly triple damage. Glass Cannon
: Adds a chance for tears to do quadruple damage. Burst tears will also do quadruple damage if the main tear does quadruple damage. Haemolacria : When razors are fired, they will connect to other tears via electricity. The electricity also does quadruple damage. Technology Zero
: Overrides Apple!. Tech X : With 14 luck, overrides Tough Love, as the razor blades do more damage anyways. With 13 luck, Apple and Tough Love each have about an equal chance to proc. Tough Love
Both the item itself and the description is a reflection of one of Isaac's nightmares between floors that involves him finding a razor blade inside a piece of candy.
The item and pickup quote are a reference to the urban legend of giving away candies with razor blades hidden inside of them as a way of harming people.