Steven Spielberg embraced modern "motion capture" technology for movies after he tried it out for fun in pal Robert Zemeckis' film BEOWULF - and his "guest shot" made it to the final cut.
The Jaws director admits he felt "depressed" when he saw Zemeckis' 2004 movie The Polar Express, because he was convinced the latest technology was leaving him behind.
He later paid a visit to his fellow director while he was editing Beowulf, and Zemeckis urged Spielberg to experiment with the new techniques.
So the Oscar-winning film-maker played around with the motion capture equipment - and his work was so good, Zemeckis left it in the final cut of the movie.
Spielberg tells Empire magazine, "When I first went on the stage to watch Polar Express, I was terrified. I thought, 'Oh my God, I'm an old man and life is passing me by. Bob's (Zemeckis) got this whole new way of making movies. I'll never be able to fathom it. I'm not going to be able to get into it.' I only stayed about half an hour and I went home very depressed.
"I got inspired to maybe want to dabble in this medium when I went back to Bob's cutting room and Bob gave me this old, plastic, chunky Panasonic camera and he said, 'Come on Steve, make a shot! Make a shot!' And he had this whole world on the screen and I moved around and the world changed. It was like a video-game. I saw Beowulf on a dragon so I brought the camera up and started on his face. Bob hit 'Play'... And suddenly I was liberated.
"I took my kids to the IMAX theatre on Broadway in New York to see Beowulf the day it opened and I went like this to (my son) Theo, 'That's my shot!'"