The professor of a university was extremely busy explaining something important with regard to his subject to the students when a girl belonging to the same class arrived late at the door and said, "May I get in, sir?"

"Don't you think you're terribly late today?" said the angry professor to the girl.

The girl then said, "When I was coming to college, a boy was following me, sir."

"I hope he hasn't stalked you. Yet, why did you get late?" demanded the professor.

Without a moment hesitation the girl replied, "But, he was walking slowly, sir."