Michael Zam, who with his writing partner Jaffe Cohen, had the original idea for what has become the FX drama, ‘Feud,’ reveals how Bette Davis and Joan Crawford got under their skin. It was with some surprise that I realized the FX 8-part series, Feud: Bette and Joan , which premieres this Sunday night at 10pm, began in my living room a decade ago when my old friend, Jaffe Cohen, said to me, “We should write a script together.