School dieticians measure students' height and weight and then factor in age, and presto! They are able to compute students' Body Mass Index.
Schools can't afford foreign language courses, sports programs or music classes. But they found funds for dieticians?
Besides, the hocus-pocus they're practicing is not an exact science. There is a big argument going on among doctors and scientists as to what a BMI really means. For one thing, in measuring body mass, it doesn't distinguish fat from muscle.
Nevertheless, if a child is found to have an unhealthy BMI, his parents get a letter from the school informing them that their child could be obese.
And what do students call these notes? "Fat letters."