Grounded!!!!!!

A person wearing a cap and glasses looks at the camera, then a fake mustache appears on their face as they open their mouth in surprise, followed by a close-up of their face with the mustache and a wide smile, before the video cuts to a text image of a joke about a child asking for the square root of 144 and the parent responding with "Who cares?!? You're grounded!!!". The setting is an indoor room with posters on the wall.