Notable appearances: The Dark Knight, Batman #609
One of the often overlooked aspects of Batman’s suit is that it actually has its own security devices built into it. Whenever Batman is out of other gadgets, he has the ability use a control in his glove to send a powerful electric charge through his costume to take down enemies that try to touch him. In The Dark Knight, one of the Joker’s goons tastes this shock personally when he tries to remove a prone Batman’s mask.
This idea originated in the comics—most famously during the “Hush” storyline when one of Gotham’s resident thugs got roasted after attempting to take a peek underneath his cowl. We just hope Alfred wears rubber gloves when doing his laundry.