A man is a person who, if a woman says, "Never mind, I'll do it myself," lets her.

A woman is a person who, if she says to a man, "Never mind, I'll do it myself," and he lets her, gets mad.

A man is a person who, if a woman says to him, "Never mind, I'll do it myself," and he lets her and she get mad, says, "Now what are you mad about?".

A woman is a person who, if she says to a man, "Never mind, I'll do it myself," and he lets her and she get mad, and he says, "Now what are mad about?" says "If you don't know I'm not going to tell you."