Body Mass Index (BMI)

Took mum to the clinic for her BMI to be measured. The BMI is a measure of the weight against the height of a person and they have a chart showing the height and the expected normal weights. After they measured the weight and height of mum, they gave her the BMI chart. Mum read the chart and then exclaimed, "Oh, now I know what's wrong with me! I am too short."