A college professor was one day nearing the close of a history lecture and was indulging in one of those rhetorical climaxes in which he delighted when the hour struck. The students immediately began to slam down the movable arms of their lecture chairs and to prepare to leave.
The professor, annoyed at the interruption of his flow of eloquence, held up his hand:
"Wait just one minute, gentlemen. I have a few more pearls to cast."