"The Old Gray Chair" by Douglas Evans

Zachary just can't seem to stay in his seat. But as it turns out, it isn't entirely his fault. Mr. Leeks, the old janitor, lets on that Zack's seat is the orneriest bucking chair at W. T. Mellon Elementary School. Well, yahoo! Looks like there's going to be a chair bustin' rodeo in the classroom at the end of the hall.