MY favourite story about Fitzgerald is related in David Niven's autobiography "The Moons a Balloon".
In 1938 MGM had been using Fitzgerald as a staff writer and script doctor largely uncredited, but the studio decided that having such a famous writer on staff and not exploiting his name was unacceptable.
As a result Fitzgerald was ordered to turn in a script for the next years big movie, an adaptation of "Raffles, the gentleman thief".
It was believed that the famous book combined with the name of one of the countries greatest living writers would guarantee a sure fire hit.
Fitzgerald did not want to do it and tried every way he could to get out of his contractual obligation all to no avail.
So slow was he eventually the studio called in two stalwarts to "help" the great man John Van Druten who wrote the 1930 adaptation & Sidney Howard who had famously just saved the originally disastrous adapted script for "Gone with the Wind" at the request of his friend John Van Druten who had his name taken off the script after huge amounts of studio interference kowtowing to Margaret Mitchell the author of the book.
Finally Fitzgerald delivered ten opening pages for a read through and everyone waited with baited breathe as Niven (Raffles) read out the great man's words.
The scene opened in the apartment of A.J. Raffles, Raffles and Gwen (Olivia de Havilland) sit on a chez lounge, lit by candle light which makes her many diamonds sparkle.

Raffles
Close your eyes

She does so demurely RAFFLES strokes her ear and ear ring

Raffles
Smile

She does so seductively

Raffles
wider

She prepares to be kissed

Raffles
That reminds me, could you give me the name of your dentist, I have a shocking toothache.

Fitzgerald was fired on the spot.