I've recently been working on trig with this too cool for school kid. We've gone as far with inquiry as was possible for him, so the lecture ensues. By this time he was interested (don't ask me why) - not "oh, how interesting"-interested, but "sitting on the edge of his chair, scrutinising every single step"-interested. We get to the grand finale, he sees it coming, shouts out the answer like a victorious leprechaun who just found his ever-evasive pot of glittering gold, and I'm like "Ouch, my good ear!", but inside I'm dancing and outside I'm grinning from ear-to-ear.
He looks up at me in amazement and says "Damn, I don't even want to know what geniuses your kids are gonna be." "Are you kidding me?", I retort. "You're mos one of them!"
