You know what I mean: the little patches of black ice you encounter in conversations when, either because you dropped History class like a flaming poker in Grade Eight, or you were on the fire escape smoking during Geography period, you are unable to contribute an iota of factual substance.
You're not alone. It's alarming the subjects that seemingly astute people draw complete blanks on. Don't feel guilty. Who can possibly be conversant on all the information amassed since we first put quill to parchment?