For example: elder says something totally illogical and when the same situation arises, you simply bring up the illogical point.
My mom, who was being the little princess, tried on some elastic waist jeans as they would be easier for her to wear out. Both were too large so I had to take them back. I asked if she would like to try a smaller size.
Answer: "I don't want to try on clothes that don't fit."
A few days later when she wanted to try on some pants that previously had been too small I simply asked 'Why do you want to try on clothes that don't fit?'
Seemed to confuse her, then it annoyed her. I let it go at that.