Some places are also called chicken skin tubes, which are part of the childhood games of the post-80s generation. Spend 20 cents, buy a long valve core, tie a knot at one end, insert a used ballpoint pen core at the other end, and then insert the ballpoint pen core into the used rubber plug. You can fill water against the faucet. The bulging water gun like a big fat intestines is ready. Niu B uses a long period of filling water and wraps it around his body for a few times, making it like a terminator holding a heavy machine gun, fighting a water war, invincible!