Before and during the production of "Saw", Whannell sought medical treatment. "I was going through a bit of a tough time healthwise and suffering anxiety," says Whannell. "The anxiety manifested itself in physical ways. I was suffering headaches everyday for nearly a year. It was serious stuff and really started affecting my life." Spending time in a hospital inspired him to endow the lead antagonist of the "Saw" series, Jigsaw/John Kramer, with cancer. "It was weird to be 25 and sitting in a neurological ward and I'm surrounded by people who actually had brain tumors. It was very scary and it was my first proper look at mortality. I really wanted to get my health back and it really hammered home how important good health is. If you've got that, you've got everything".