My all-time favorite commercial is one that I saw one time during the 1996 Iowa/Arizona football game. I haven't seen it since and can't seem to find it anywhere online.
It was part of the "NFL Family" series of ads promoting NFL Countdown. It starred Chris Mortensen, Joe Theismann, Chris Berman, Tom Jackson, and Sterling Sharpe as the McGinty brothers and featured children playing them in home movie flashbacks. Harry Dean Stanton was their father, Joe McGinty, who was obsessed with football and tried to instill that obsession in his sons.
Here's the only one of the series that I can find:
The best one featured a voice-over saying "Every year the McGintys went trick-or-treating as Coach Paul Brown" as home movie footage showed the five young brothers dressed in fedoras and trench coats.
"In 1969, Chris wants to go as a pirate. Dad says okay....but it has to be a Paul Brown pirate".
The commercial ends with footage of young Chris Berman wearing a fedora, a trench coat, and an eye patch.