Thanks for alerting me to that comment thread. I feel it is my duty to police all discussions which might touch on a film with which I was involved, and when I saw this, I felt obligated to speak up:

"I don't think Madonna ever had a horse's head put in the producer's bed in order to get a movie role."

As I said in the comment "I'll have to ask the producer of her first film (A Certain Sacrifice), but my recollection is that she wrote a rambling three page letter to get the role, and then later sued him when the film was released.

There's a certain polarization there, I think.