A vibrant cartoon with colours and smooth animation. A high-quality 3D animated comedy scene inside a modern secondary-school classroom. A fictional male teacher stands at the front of the room teaching a class. Stylized realistic 3D character design, expressive face, realistic proportions, detailed classroom environment, polished 3D animation similar to a modern animated video game. The teacher calmly talks and gestures naturally for several seconds. He then slowly tilts his head to one side, pauses with a confused expression, and makes an exaggerated comedic reaction. The students look at each other, become shocked and confused, then suddenly stand up and run out of the classroom in chaotic but harmless cartoon fashion. Smooth natural body movement, convincing walking animation, fluid head rotation, realistic arm and hand movement, expressive facial animation, consistent character appearance throughout the entire video, excellent physics, cinematic lighting, detailed 3D environment, fixed wide camera shot, clean composition, smooth motion, comedic timing. No gore, no violence, no text, no subtitles, no logos, no camera shake.