Horse sense
In “Close Encounters,” a ninth-season “Dallas” episode, Sue Ellen (Linda Gray) is at the Ewing Rodeo when she approaches Mandy (Deborah Shelton), who turns away.
SUE ELLEN: Mandy. [Mandy turns back to face Sue Ellen.] I’m Sue Ellen Ewing.
MANDY: I know.
SUE ELLEN: May we talk?
MANDY: Why?
SUE ELLEN: [Steps closer] I have something to tell you that might be helpful. You’re not the first girlfriend J.R. has had. [They begin walking together.]
MANDY: That’s helpful?
SUE ELLEN: I’ve seen the way he’s treated all the others.
MANDY: Look, this time it’s different.
They stop walking, face each other.
SUE ELLEN: Is it?
MANDY: Yes, it is. J.R. and I love each other. You just don’t know him the way I do.
They resume walking.
SUE ELLEN: Mandy, I know J.R. every which way there is to know him. And he’s never going to change. Never. He’s going to use you like he’s use all the others, and then he’s going to walk out on you and never come back.
MANDY: You really want me out of his life, don’t you?
SUE ELLEN: Not for the reasons you think. I don’t want him back. Mandy, I’m telling you this for your own good — because J.R. destroys every woman he goes to bed with. It’s by the grace of God that he didn’t destroy me. Don’t let him do it to you.
MANDY: [Begins to cry] Thanks for the advice. You’ll forgive me if I don’t take it because you don’t know what the hell you’re talking about.
She begins to walk away, when Sue Ellen grabs her.
SUE ELLEN: Isn’t it strange how the mistress always thinks she’s smarter than the wife? If she’s so smart, why is she the mistress?
Watch this scene in “Close Encounters,” available on DVD and at Amazon and iTunes, and share your comments below.
Dallas Decoder 
Linda Gray should have been given an Emmy (YM) for that closing line! And shes 75 now, I mean look at those legs, WOW!
Great lines, specially Sue Ellen’s.
I PHYSICALLY HATE Mandy Winger. How dare she. Like actually how DARE she. Full of her own self importance. Pure evil.
Sue Ellen was definitely right about that! I disagree with soulbleed1976, though…I don’t see Mandy as evil.
I think Mandy was a lost, confused young woman who knew (deep down) that Sue Ellen was right.
But she couldn’t accept the truth…that explains her reaction. Being the “other woman” requires some denial.
She couldn’t handle the truth that she was just another of JR’s toys to be used and discarded. With time and experience, she might have wised up.
Now Kristin, on the other hand? That is evil to me. She wants what Sue Ellen has and will stop at nothing to hurt her older sister.
She has no shame or remorse at all. She just wanted to hurt Sue Ellen out of envy and malice.
With other women like Mandy, I think it was more that they thought JR would change. They were also guilty of being with a married man, but they weren’t evil to his wife the way her own sister was.
Kristin wanted to destroy Sue Ellen. Mandy didn’t, in my opinion…she was just another girl who needed to hear the truth about JR.
Mandy would have learned the hard way because she didn’t heed Sue Ellen’s warning. But I don’t see her as evil, just young and immature.