A razão para a animosidade nunca é revelada explicitamente no programa, no entanto, Jerry Seinfeld deu uma razão em comentário aos DVDs como explicado no Newman (Seinfeld) entrada da Wikipedia em Personalidade :
When asked about why the character Jerry hates Newman, Jerry Seinfeld explained it in the Season 3 DVD inside look of the show:
He was the first person on the show, my own show, who was coming on to sabotage me in some way. And so why would I not hate him forever for that?