Quickly now: name a common household item that has 15 times the energy density of gunpowder and 10 times that of TNT.
That would be gasoline, the active ingredient in the Molotov cocktail.
Here is an Egyptian tank getting a lesson in physics.
Even as the tables have turned on anti-Mubarak protestors in Tahir square, at least one report coming out of Cairo holds that army tanks were rolling out of the way so as not to be hit by Molotov cocktails thrown by protestors. Modern tanks can’t be harmed by Molotov cocktails, but their sensor can be blinded, and they appear to have a powerful psychological effect on the soldiers inside.
it’s not the delivery mechanism that matters, it’s the gasoline inside that is such a powerful equalizer when used by citizens who are otherwise unable to access weapons on par with those wielded by modern militaries.
Image of the Molotov attack is a screen shot from the video at the link.