I always thought this was a cute video. When we think about Newton’s 2nd Law — that’s F = ma — it’s hard to find examples of where a tiny amount of force actually equates to motion. In our world, friction predominates these tiny forces, and so it’s hard to find good examples of this.
This, video, however is just adorable. It shows that a tiny force can create motion when it acts on a body that is much much larger than the force. There’s also a flea pulling a chariot. You can’t get much better than this.