a friend of mine once told me that if he ran into his ex wife on the street he'd treat her like anyone else.
his ex-mother-in-law, however, he said he'd punch in the mouth if he ever saw her again. from what i understand, she shoved her nose so far into their lives that it drove them apart.
i don't agree with hitting a woman (and this guy would never actually do it) but to hear that type of hatred for someone come out of his mouth was a complete shock.