(Image above: "Wikipedian Protester" by Randall Munroe, in his xkcd comic, used under Creative Commons Attribution-NonCommercial 2.5 License.)
("Wife and husband yelling to each other." Used under license. Copyright: http://www.123rf.com/profile_semenovp semenovp / 123RF Stock Photo)
(Legolas. The Lord of the Rings: The Two Towers. New Line Cinema, 2002. Used under 17 USC §107 [Fair Use] for educational purposes.)
("Confused burglar with speech balloon concept, thief with balaclava caught confused and without idea in front of the grunge concrete wall.” Used under license. Copyright: http://www.123rf.com/profile_stevanovicigor stevanovicigor / 123RF Stock Photo)
("Chain breaking." Used under license. Copyright: http://www.123rf.com/profile_matthiashaas matthiashaas / 123RF Stock Photo)
(“Startled young man with backward baseball hat.” Used under license. Copyright: http://www.123rf.com/profile_
("Very angry businesswoman point her finger to camera, isolated on white." Used under license. Copyright: http://www.123rf.com/profile_miszaqq. miszaqq / 123RF Stock Photo)
(“A very frustrated and angry woman screaming. Isolated on white.” Used under license. Copyright: http://www.123rf.com/profile_jaykayl jaykayl / 123RF Stock Photo)
(“An excited happy university or college student, holding a text book and with thumbs up approval success, hand sign gesture. White background.” Used under license. Copyright: http://www.123rf.com/profile_lovleah lovleah / 123RF Stock Photo)