For example, one day Mr. Twit is enjoying a big, bubbly beer when Mrs. Twit pops out her glass eyeball and plops it into his mug. After spying the eyeball floating in his beer, Mr. Twit flees the scene leaving the mug and eye behind. She enjoys a good laugh.
To get back at her, Mr. Twit puts a frog in her bed. Throughout the book they quarrel constantly, not with words, but by playing mean tricks on one another.