A%20funny%20wooden%20whistle%20which%20makes%20very%20silly%20noises%2C%20reminiscent%20of%20The%20Clangers%20or%20possibly%20the%20noise%20made%20when%20someone%20dropped%20their%20trousers%20during%20a%20Carry%20On%20film!%20Sliding%20scale%20musical%20instrument%20-%20everyone%20should%20have%20one%20for%20all%20the%20hilarious%20moments%20in%20life.