A tea vendor sets up a 'chai dhaba' in the capital. People starts flocking to the dhaba for a cup of chai. Immediately a rival sets up another dhaba in the vicinity selling milk with the caption ' Why drink chai to spoil your health when healthy milk is available'.
Finding the rivalry between the two vendors, a common man pitched in and started selling a special drink by mixing half a cup of chai from first vendor with half a cup of milk from the second and named it CM (Chai milk).
CM became instant hit with the masses!