"I don't want that, it causes CANCER"

"I read on the internet that it caused cancer."
"Oh really, where did you read that?"
"On the internet"
"Where on the internet?"
"It was on the internet on my computer"
"Which site?"
"A site on the internet"
Etc, etc.

The internet is unregulated, anyone can say anything they like:
"Distilled water causes cancer", there you go, now it's 'official'.