From The Secret Teacher-Talk Dictionary
Col-lat-er-al Learn-ing n. 1. Collateral Learning is that which happens in a teacher's classroom in spite of the best efforts of a school's administration to thwart, stymie, distract, disrupt, obstruct, or otherwise prevent actual student learning from occurring through a variety of artifices in the form of countless classroom interruptions generated by the school's administrative staff. 2. Often thought of as an accidental occurrance, Collateral Learning frequently results from subtle planning and execution by the classroom teacher to overcome an ineffective curriculum inflicted upon students by those non-teachers who work in District Offices. Enrichment materials, many times purchased by the teacher from his or her own purse, are oftentimes used to great effect.