Brendon Urie appears shirtless throughout.

At the beginning people trying to get catch Brendon in ropes

Very scary part 2 of this is gospel

He acts very scarily and so self confident he is even more scary

Brendon turns into a demon graphically. Not gory, but frightening, and with sound effects unpleasing to the ear.

The whole video revolves around Brendon going to Hell and becoming the devil. The setting, atmosphere, and concept are altogether frightening.