http://en.wikipedia.org/wiki/Death_of_James_Dean#Accident
"When Dean introduced himself to British actor Alec Guinness outside the Villa Capri restaurant in Hollywood, he asked him to take a look at his brand new Porsche Spyder. Guinness thought the car appeared 'sinister' and told Dean: "If you get in that car, you will be found dead in it by this time next week." This encounter took place on September 23, 1955, seven days before Dean's death."
http://en.wikipedia.org/wiki/Death_of_James_Dean#Racing_career_background
http://www.snopes.com/movies/actors/dean.asp
"Apparently when Dean introduced himself to Alec Guinness outside of a restaurant on 23 September 1955, he asked him to take a look at the Spyder. Guinness thought the car appeared "sinister" and told Dean: "If you get in that car you will be found dead in it by this time next week.”
http://www.thebiographychannel.co.uk/biographies/james-dean.html
"In Hollywood in 1955, he met his acquaintance, film star James Dean, outside an Italian restaurant. Dean showed him his new car.
‘The sports car looked sinister to me,’ he wrote, ‘. . . exhausted, hungry, feeling a little ill- tempered in spite of Dean’s kindness, I heard myself saying in a voice I could hardly recognise as my own: “Please never get in it. . . if you get in that car you will be found dead in it by this time next week.” Dean laughed. He died in the car just under a week later.’"
http://www.dailymail.co.uk/tvshowbiz/article-2283983/Sir-Alec-Guinness-Unpublished-diaries-letters-reveal-gleeful-malice-acting-legend.html