The (500) Days of Summer moviemaker felt sure he had found the perfect Peter Parker in Andrew Garfield and Gwen Stacy in Emma Stone - and he knew he had struck movie gold when he finally got them together.
In a new interview with the Comic-Con Annual, Webb says, "We did screen tests (with Andrew) and Emma just showed up and it was all over.
"Andrew's a pretty intense guy, but she had him in stitches between takes. She had him just cracking up, and I would watch them in between takes. They didn't know each other and she's just so comfortable and so confident.
"You need that energy because Andrew is a very dominating presence and she just went toe to toe with him."