Have you ever had to stand up to your parents?

Was it difficult to do this?  Parents can intimidate us like nobody else.  I have had to stand up to my parents, each exactly one time.  My dad was being particularly difficult and I let him have it.  I pretty much blew my stack and didn't back down.  He knew he had it coming.  Whenever I recall the particulars, I get nervous all over.  Parents know this and they can use it to their advantage to make themselves feel better.

I stood up to my mother once, too.  It was on the phone and she was being especially manipulative and I cussed her out and she responded with more crocodile tears.  That's really what she has in her.  Poor slob.  We didn't talk for two months.  Actually, now that I think about it, I stood up to her twice.  I told her she was a classic narcissistic mother, all the signs were there.  She said she was never going to speak to me again.   I touched a nerve.  It was quite gratifying to get that off my chest.  The silent treatment lasted a week.   

Some people out there will say that one's parents are sacred and these people usually will not budge on this regardless of circumstances.  Mothers, in particular, are held as sacred.  I am not a member of this camp.  Stephen King once said that parents try to murder their own children.  I totally get that.  Parents can be nice and loving, but they can also be just terrible to their children.  I know that parents are people, too.  It's a fine line where to cut them some slack.  

So if you ever had to let a parent finally have what was coming to to them, how did it go?