The performers took the rehearsal stage on Saturday (April 12) at L.A.'s Nokia Theater, and they brought their signature ski masks with them -- one for everyone in the audience -- making for a rather terrifying scene.
Singer Tyler Joseph also put one on later in rehearsals, as Josh Dun drummed on in the background.
For fans of the Columbus-bred duo, the Jason Vorhees-esque look is nothing new. Tyler and Josh wore the headgear during their blowout performance at last year's Hangout Festival and in their video for "Guns for Hands."
But then again, as with every MTV Movie Awards, you never really can know what to expect. The guys are set to perform their new single "Car Radio" at Sunday's show, which kicks off at 9 p.m. on MTV.