What is the most disturbing thing someone has ever admitted to you?

As the title says.

This page is a permanent link to the reply below and its nested replies. See all post replies »

That they murdered someone. I saw the actual murder I was looking through the blinds right outside my bedroom. but I didn't see the shooter. So he made sure to find me and tell me that I saw nothing that night. So I looked him in the eyes and said, "I didn't see anything". I was 10. Hes dead now, he was also murdered.