For me you could just pick any of the 70s playoffs losses to Vikings and Cowboys.
I was young and had no ability to process was life and death to me and I would cry my eyes out.
I always smile when I read Gator talking about his best moment being Ferragamo to Waddy against Dallas....I was already in full cry mode with my older brother yelling at me to "shut up you little baby the Rams are going to win"
And Bammm!!! Feragamo to Waddy exorcised a lot of demons for me