In Crosswinds of Fate, Hermione and Luna are working on an essay assigned by Professor Tohsaka and end up discussing the issue of inbreeding:
Sucrose Octanitrate.
Proof positive that with sufficient motivation, you can make anything explode.
Quote:"... according to... a pure-blood I met, nearly all pure-bloods in Britain are related somehow."--
"Wait, half the people here are my cousins?" Luna inquired. "Or aunts or uncles?"
"Something like that."
"Then that means..." The Ravenclaw witch frowned. "... that I have been missing out on many Christmas presents."
Sucrose Octanitrate.
Proof positive that with sufficient motivation, you can make anything explode.