Donna was new in town, and still trying to find her way around.

She walked up to a man standing outside the school building.

"Can you tell me where the library’s at?" she asked.

The man stared down at her, raised his eyebrows, and said in his stuffiest voice, "Young lady, it is not proper to end a sentence with a preposition."

Donna stared back at him.

Then she said, "Can you tell me where the library’s at, jerk?"