What happens that takes Leonard mead by surprise?

In Ray Bradbury's short story "The Pedestrian," Leonard Mead is taken by surprise when he is stopped by a police car while walking alone at night. He is astonished to find that in a world dominated by technology and television, he is the only person engaging in such an old-fashioned activity as strolling outside. The encounter highlights the stark contrast between his appreciation for the physical world and the isolation brought on by societal reliance on screens. Ultimately, he is arrested for his unconventional behavior, emphasizing the story's critique of a conformist society.