About four years ago I was chatting with a couple I know, and I knew she was into ancestry -- having done it long before there was an internet. She offered to look into mine so I gave her my mom and dad's sides -- which I only knew about two generations back.
She is a paying member of Ancestry.com and what she found out was amazing. Following my maternal grandmother's maiden name, she followed it back -- unbroken -- to my 26th g-grandfather, born in 1040 AD in England.