The lyrics were also changed, such as changing "Splinter taught them to be "ninja" teens" to "Splinter taught them to be "fighting" teens". The policies also had other effects, such as editing out use of Michelangelo's nunchaku (which were at the time banned by James Ferman, chairman of the BBFC, from appearing in films) and generally toning down the usage of all the turtles' weapons. The showrunners elected to remove Michelangelo's nunchaku entirely during season four; replacing them with a grappling hook called the "Turtle Line" that served as Mikey's signature weapon for the rest of the show's run.