Collapsing into a pile of broken limestone. So no change then?
Thinking about it for a day, I don’t know that I can think of anything (within the realm of practicality) better than Rods from God. But after a couple dozen of those, you’d still just have pulverized a single pyramid. From there, it’s probably just as efficient to use a row of high-powered fans as anything to try and disperse the sand and gravel.
During actual blasting? Actually little change. In situ limestone has a density of around 1.9 If you drill and blast it with dynamite, you fragment and loosen it, giving a density of around 1.2 for the same volume as in situ rock. Just makes it easier to shovel out.
Add a case of Monster, Red Bull, or Rip-It to that mix, and you might just see a giant crater form before your eyes as the prives tear shit up looking for the Precious.
I really hope you people aren’t serious in support of this. For real?
I’m generally in support of mind exercises, yes.
66 posts and nobody has mentioned the OP’s username/post combo?
I do think a strike with thermonuclear tipped ICBM’s would probably be entertaining, you could even sell tickets for ringside seats with dark-tinted glasses as well as streaming it live. 
Thanks for the answers everyone, all the ideas are pretty entertaining!
btw that picture showing the Pyramids are basically inside Cairo has blown my mind, I really did assume they were out in the desert somewhere.
You have a relatively small number of posts here. This forum is full of thought experiments for things that would not or could not really be done. People ask what would happen if the sun suddenly was gone. I would hope you don’t seriously think that anybody here (or anywhere) would actually have the will and wherewithal to destroy the great pyramids.
Speak for yourself–I’m taking those bitches down. I’m currently attempting to breed gigantic mutant badgers using gamma radiation. Then, I only need slather the pyramids with cow juices.
Badgers?
We don’t got no badgers!
I don’t have to show you no stinking badgers!
I think Heinlein solved this in The Moon is a Harsh Mistress.
Build a moon base, a rail gun, and a series of iron clad rocks. Move the aiming point from Cheyenne Mountain to Giza and you’re good.
Someone else can figure out how many and what size of rocks are needed, but you up the entertainment factor by varying the angle of attack, sending in groups sometimes, singles others. I would guess that if you add various elements to the iron cladding you could also vary the colors the meteorites display as they come crashing down (like in fireworks).
Cool!
We can sell tickets, hot dogs and beer.
Plant stories worldwide that powdered pyramid stone is a sure cure for impotence.
Well, all you’ve done is change the pyramids from piles of blocks to piles of slightly crushed blocks. If you have to shovel the crushed blocks out afterwards, you might as well just move the uncrushed blocks themselves.
That’s not “blowing up the pyramids”, that’s carting off the pyramids.
Well, yeah, but “Best Way to Cart Off the Pyramids” doesn’t have the same ring to it.
I think a lot of people are ignoring the above part of the OP. In particular, I do not including the suggestion of
[QUOTE=silenus]
2 five-year-olds, a plastic hammer and a puppy. Pyramid to pile of rubble in 15 minutes.
[/QUOTE]
in this chastisement.
Blow up the Pyramids?
I didn’t even know they were inflatable! 
A retaining wall and billions of gallons of concentrated HCL. Plop, plop, fizz, fizz…