Dr. Shapiro's Question of the Day VI by ShapiroA

Question 11

It's Thursday, which means today is the day BroomBear comes to me. A loud ruckus announces BroomBear's arrival, and everybody gets out of BroomBear's way -- but when BroomBear leaves, everything is a little better than before. BroomBear is not a nightmare nor an imaginary friend. Who or what is BroomBear?