 Jays line on the "driver airbag" ("Actually it came with a black  dude, but he kept getting pulled over.") was not written in the  script as Will Smith (I) (qv) improvised it at the time. The  producers liked it so much it even made the theatrical trailer. The  Director however was not happy, it was played over and over in the  month of June prior to the films release, making the joke old and  tired by the time people saw it in the movie.