Panchatantra Monkey Wedge

tale:panchatantra_monkey_wedge

Carpenters leave a half-split log held open by a wedge. A meddlesome monkey, left alone, sits astride the log and tugs the wedge loose; the log snaps shut on him and crushes him. Moral: those who meddle in matters not their own come to grief. — Panchatantra (attrib. Vishnu Sharma)