Whats a good hook for my essay?

Whats a good hook for my essay?
my essay is on a comparison to Russia an China revolutions and i need help to get started off. can someone give a quick example to get me started off? also, im getting hook and intro confused…

hook–what makes your reader want to keep reading
intro–where the hook is usually located–states the purpose of your essay and tells a little bit about what you intend to say

for example if someone was writing a paper on cats a good hook might be:

“Cats, long believed to be the ultimate loner pet may actually be the most emotionally needy of all small mammals.” This hook is unexpected and you don’t know the answer already–it makes you curious enough to read more. The intro would probably go on to tell about new studies showing that cats need more attention etc….

hope that helps.