I met a kid at a math competition who insisted that he was a robot. He told us all he was 11.8 years old, and he didn't bend his elbows when he walked. He didn't smile or laugh with the other kids, and just stayed to himself the whole time.
I only saw him that one day, but I can tell you he was fully committed to being a robot that day.
My mind immediately went to Karen Wetterhahn. Usually it's just you, but sometimes it is mercury.