These are the events just prior to Halloween as described by Scout in Chapter 27 of To Kill a Mockingbird. First, Bob Ewell "acquired and lost a job in a matter of days." Work was something foreign to Bob, so it's no surprise he was fired for "laziness." However, Bob blamed Atticus for getting him fired. Second, Judge Taylor discovered a prowler outside his back porch with the screen door left open. He only got a glimpse of the man's shadow as the prowler made his escape, but he was ready and waiting for him later with a shotgun in his lap. Next, Helen Robinson, Tom's widow, was harassed by Bob Ewell as she walked to work. Bob "chunked at her" and later cursed at her before he was threatened himself by her boss, Link Deas. So, Bob Ewell was responsible for two of the situations--and it was probably him that Judge Taylor saw fleeing from his porch as well.