When Bassam Khalaf raps, he calls himself the Arabic Assassin. On the Web: Khalaf's music Web site. NOTE: This site contains obscene material A Houston-based rapper said his decision to call himself the "Arabic Assassin" was meant to stir up a bit of controversy in the music business. The stage persona — along with some incendiary lyrics in one of his songs — also helped get Bassam Khalaf fired this month from his job as a baggage screener at Bush Intercontinental Airport. "I thought it was kind of ridiculous. What does my music have to do with my job?" Khalaf...