The Wanderer Wrote:The quick, easy, utterly reliable magical oath - frequently of the form "So-and-so pulled out his wand and said, 'I swear on my magic that this is the truth. So mote it be.'" - with the penalty for swearing falsely being loss of the oathgiver's magic.I recall a fic that addressed that gimmick. Harry regularly faked this by not actually drawing on his magic while making the oath, but just casting a silent 'Lumos' to make the wand-tip glow as if he had. Everyone thought he was actually swearing the oath for real and believed him.
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Sucrose Octanitrate.
Proof positive that with sufficient motivation, you can make anything explode.