TromBONE

Bill Cipher, a yellow triangular figure with a single eye and top hat, stands in a dimly lit room with orange walls and a checkered floor, then floats forward as the camera pulls back to reveal Sans, a white skeleton in a blue hoodie, who turns to face him. Sans gestures with his hands, then points his right index finger upward, while Bill Cipher's head briefly transforms into a grotesque, fleshy skull before returning to normal.