Why does my 67 year old mother make up ridiculously transparent excuses for everything? She shows no signs of dementia. It's pointless and frustrating for others and she gets enraged when confronted with it. For example, she ate a sampling of fairly rich foods when I gave a cocktail party and gave herself an upset tummy. After hearing the toilet flush all night, I asked if it was all the food and she agreed. Then when she went to make cocoa, I suggested tea and she responds that it was having a cup of tea after the party that made her sick, not the rich food. When I laughed and asked why she had to try to bull me and make excuses instead of just saying she'd rather have cocoa, she went ballistic. It was quickly followed by threats to leave and screaming about what a horrible person I am. Just to note, she has nothing and is entirely supported by me and squeezes my funds like her personal sugar bear. She's never had it so good so we both know she isn't leaving. But why the constant silly excuses?