[[acronym, "Incredibly Sadistic Bastard"] 1. An obnoxious teacher, esp. one who seems to relentlessly enjoy torturing his or her students. The archetypal ISB in the CRFH world is Prof. James Dover (see [Board], sense 2; see also the storylines "Who needs Cthulhu when you have Calculus" and "Test Date"). 2. By extension, anyone who obnoxiously enjoys to torture people under his control like, for example, an evil fanficcer. Examples: [Strangeone], whose fics are filled with torture against April, and [Benjamin Embarec], whose presence is often a torture for the [Board].