NBC: Yellow WR swimming line drew millions of N.F.L. fans to Olympic broadcast thinking graphic indicated first down

American football fans strongly related to the moving yellow world record pace line, which appeared during the men's and women's Olympic swimming broadcasts. NBC announcers, in an effort to lure more N.F.L. viewers, referred to the line as the first down line. 'The swimming guy kept almost getting a first down,' said one fan. 'It was great.'