My girlfriend's mom is like that. A lot of the time she's really nice and I genuinely like her...but then she does things like scream at her daughter for having strep throat. I remember once she tried to make me take her to the doctor's office in town (an hour's bus ride and I didn't have a license...I was 16 at the time). She was yelling at my gf the whole way home in the car, and my hands were shaking I was so angry. I'm not a very easily angered person, so thats saying something.

My friend Jessi's mom is also psycho. She keeps freaking out at Jessi and accusing her of being a drug dealing slut. Jessi smokes weed with me occasionaly and gets drunk on occasion, but she doesn't sell weed and she's not a slut. Maybe a quote would best express her mom's insanity:

"I know you're on drugs, Jessi, I can smell the "E" on you!"

Need I say more?