To help demonstrate Newton's 3rd Law of Motion, I have a student stand on a rotating platform and swing my homemade Mjolnir (http://rjcosplay.blogspot.com/2012/05/my-mjolnir.html). I had "Loki" stand in front of him and I assured her that she could not be hit with the mighty hammer. Sure enough, every swing of the hammer moved "Thor" in a circle in the opposite direction of the hammer and he never landed a blow.
We also demonstrated the 3rd Law by using balloons. A couple students aimed them at their foreheads and let go. The air rushing out of the balloons forced the ballons into their faces.
As a bonus, we did a demonstration on the conservation of momentum. A ping pong ball dropped on a golf ball is launched super high due to the larger mass of the golf ball.
These experiments look like a lot of fun. Actions speak louder than words, right?
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