On 2 October 2016 I was reading a book (Critical Assembly - A Technical History of Los Alamos during the Oppenheimer Years, 1943-1945). I read the last line of page 117:
During the summer of 1944, however, 3-inch testing became less de-
I turned over and continued reading:
cay series, is ordinarily isolated from lead concentrates. Although en-
I realised that this did not make sense. I then discovered that I had turned over two pages, and instead of reading the top of page 118, I was reading the top of page 120.