In his October 2000 column, the Perfect Master addressed the inquiry, “I plan to destroy the moon. What effect would this have on the earth?”.
Later that month, a poster wondered how that task might be accomplished.
Well science presses onwards. Gentleman and scholar Sam Hughes has now compiled the Top 10 Ways to Destroy Earth. (Alternate link (includes forum!).)
Given this list, destroying the moon should be child’s play: as the Bad Astronomer noted the Earth, “has 81 times the mass of the Moon, so it takes 81*81 = 6500 times the energy to blow up the Earth.”
The remainder I will leave as an exercise for the reader.