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Stone Rule
(i.imgur.com)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
Oooh, oooh, I got one.
I went to multiple protests after the Iraq war and got my Iraq war-supporting government to immediately plummet in support and lose the next election. It was nice. No harmed irreplaceable monuments that I remember. The marches I attended were entirely peaceful, as well.