Mafia II's Demons
http://youtu.be/EkeG5efaJys
https://en.wikipedia.org/wiki/Mafia_II

Mass Effect's Chicken Dance
https://www.youtube.com/watch?v=GYrY72OqXIw
https://en.wikipedia.org/wiki/Mass_Effect
https://list25.com/25-bizarre-video-game-glitches-you-should-watch-out-for/

San Andreas's Underwater Photographer
http://youtu.be/LIkc0hmh6wc?t=6m50s

Crysis Land Sharks
https://www.youtube.com/watch?v=W0FiwWjv3OY
https://en.wikipedia.org/wiki/Crysis
Gears of War's Irish Jig
https://www.youtube.com/watch?v=Suj1NyTol-s
https://en.wikipedia.org/wiki/Gears_of_War

DayZ Soulless People
http://youtu.be/KHZgKzxA-IM?t=8s
http://www.cracked.com/article_21694_6-creepy-glitches-that-turn-famous-video-games-horrifying.html
https://en.wikipedia.org/wiki/DayZ_(video_game)

FIFA Giants
https://www.youtube.com/watch?v=V3RKVY21tBc
https://www.youtube.com/watch?v=0ysll3Ogw-4
https://www.youtube.com/watch?v=pLuDxiewkv8

Rocky's Bizarro World
http://www.youtube.com/watch?v=HdWRTleizFU#t=12m44s
http://www.cracked.com/article_19507_the-8-creepiest-glitches-hidden-in-popular-video-games.html

Fallout 4's Smooth Criminal
https://www.youtube.com/watch?time_continue=19&v=5Z4h0z9l5IU
https://www.reddit.com/r/fo4/comments/8p7lq7/nick_valentine_learned_a_new_walk/

Surgeon Simulator's Nightmare
http://youtu.be/7_yUdW4jgmI