“From his modest classroom at Hobart Boulevard Elementary School in Koreatown, Rafe Esquith became an education superstar. His teaching techniques brought him worldwide recognition, and his books became models for how to engage young students.” But since April, Esquith has been banned from his own classroom. And as far as anyone knows, it was because a joke that was entirely harmless. (But it was told in a district that has faced a lot of harm.)