The 8 sure signs someone is a sheep (99% accuracy):
1 If you run around crying about the masses being sheeple, all the while you quote Alex Jones and paste links from infowars.com.
2 If you call the Perfectibilists "The Illuminati" and attribute every calamity to their machinations.
3 If you are religious.
4 If you think Ron Paul is the best, most honest politician who ever lived.
5 If you are a laissez faire capitalist who thinks all government is bad. Even democratic government.
6 If you think the powers at be are a unified conglomerate in a singular conspiracy against YOU, instead of several competing factions with their own goals, ideology and objectives.
7 If you believe in pseudo scientific bunk like Nibiru, 2012 magnetic pole-shifting, or Grey Aliens in saucers from Xenu.
8 If you think you have it all figured out. Because...you don't.