If you have ever watched Doraemon series, you will probably have encountered “Bamboo-copter”, the device that Doraemon puts on top of his head to fly. The video below (from Toribia no Izumi) explains the possibility of creating “Bamboo-copter”.
The video started out with the narrator explaining that the same question has been asked in Chiba University’s college entrance examination. The question which seems to be off-topic from school’s related courses was designed to evaluate the creativity of the examinee. In the end of the video, the professor who designed the question explains that there are 2 answers for the question:
1. It’s not possible to use a bamboo-copter to fly, because your lower body will end up turning the opposite direction for the bamboo-copter to be able to fly.
2. It’s possible if you put a small bamboo-copter in your feet to stop your body from rotating around (like a tail rotor of a helicopter).