One day she told him that the next day was her birthday. He told her he would send her a bouquet of roses... one for each year of her life. That evening he called the local florist and ordered twenty-one roses with instructions that they be delivered first thing the next morning.
As the florist was preparing the order, he decided that since the young man was such a good customer, he would put an extra dozen roses in the bouquet.
The fellow never did find out what made the young girl so angry with him.