Squeeze rocket launcher
According to Newton’s First Law of Motion, an object at rest wants to stay at rest if it’s not moving, and to keep moving in a straight line if it is moving. That straw will not move unless some force is applied to it to make it move. The Third Law says that for every action there is an equal and opposite reaction. As you squeeze the bottle, air is forced out of the smaller straw and pushes against the clay in the larger straw. The resulting force causes the straw to “launch” through the air!