The following interchange reveals why one should never argue with one's mother, whether she has Alzheimer's (as mine does) or not:
Mom: Would you get me a diet coke?
Linda: The dentist says that the acid in the diet coke has hurt your teeth and that you shouldn’t have any for 4 hours before you brush your teeth at bedtime.
Mom: (aggravated) How old am I?
Mom: (disgusted) Exactly how much longer do you people think my teeth need to last?