Mr. Ewell wrote on the back of the envelope and looked up complacently to see Judge Taylor looking at him as if he were some fragrant gardenia in full bloom on the witness stand, to see Mr. Gilmer half-sitting, half standing at his table. The jury was watching him, one man leaning over with his hands over the railing.
“What’s so intrestin’?” he asked.
“You’re left handed Mr. Ewell,” said Judge Taylor.”

– Harper Lee

To Kill a Mockingbird, Chapter 17. Atticus intelligently asks Bob Ewell, who has little control of his lies in the witness box, to write his name on an envelope. Judge Taylor observes Ewell uses his left hand. Atticus believes Ewell beat his daughter Mayella, not Tom Robinson. Ewell’s left-handedness and Tom’s disabled left arm lend weight to this because Mayella was hit on her right side by someone who led with their left hand.