Jake Gyllenhaal is in Cannes to support his film "Zodiac" which has been entered in the competition phase of the film festival. The film is based on the true story of the unlikely quest by Robert Graysmith, a cartoonist on the San Francisco Chronicle, to identify a 1960s serial killer known as the Zodiac. Gyllenhaal recalls the amazing experience he had working with Robert Downey Jr. on the film.

"A very good, typical actor has about 25 really interesting choices and ideas within a minute. And then there's Robert Downey Jr. who has, I would say, 500 to 750 ideas," Gyllenhaal said after the press screening of the film at Cannes.

"Some people would call that madness. I would call that genius," he said.

"You're running around an actor and then they're chasing you, all of a sudden -- that's a wonderful thing where rhythms are all over the place, it's like playing jazz with somebody."

If you haven't seen the film, it really is amazingly well acted. Don't be afraid of the serial killer premise. As director David Fincher said: "I don't think this is a serial killer movie, I think this is a newspaper movie"

More photos from the Cannes photocall for Zodiac after the jump.

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