Lip sync the line about everyone underestimating you, hit the word boo with a hand or mouth gesture, and cut to a finished horror makeup or costume look like a bandaged face or a clown with sharp teeth.
Day 1 of a 31 Days of Halloween series. She talks to camera on a red backdrop, then the video snaps to a full mummy makeup with a bandaged face. Her audience treats the series like an annual event, with people saying it is back and a few admitting the jump scare got them.
She gestures at the camera under the transition caption, then the video cuts to a Silent Hill nurse lurching down a hallway. Some people in the comments say she won the trend, others point out she has done this costume before.
Red hair, red glasses and a stuck-out tongue, then a cut to a Demogorgon face with the petals open. It is a Stranger Things cosplay, and the Portuguese and Spanish comments mostly say it turned out great.