It had been quite an impromptu lecture!

But for the only time they were not interested in my impromptu lecture.

Larry, touched to the quick, stood up and gave the most stirring impromptu lecture of his life.

He has given an impromptu lecture to Bobby Bonilla.

At breakfast the next day he would give an impromptu lecture on what he had learned the night before.

And there and then he delivered a whole impromptu lecture, astonished that he could do it.

Oversteegen, on the other hand, had listened to his entire impromptu lecture with a steadily growing smile and no sign at all of confusion.

Finding some of the local residents sadly ignorant of the subject, he gave them an impromptu lecture.

Nixon gave an impromptu lecture about a president's heavy burden during wartime.

"And I apologize, Prilicla, for making you the subject of that impromptu lecture without first asking your permission."