The mysterious force changing wind patterns across the globe that is caused simply by the earth rotating. For more information I recommend:

Anders Persson, Back to basics: Coriolis: Part 1 — What is the Coriolis force?, Weather, 55, (2012).
Anders Persson, Back to basics: Coriolis: Part 2 — The Coriolis force according to Coriolis, Weather, 55, 6, (182-188), (2012).
Anders Persson, Back to basics: Coriolis: Part 3 — The Coriolis force on the physical earth, Weather, 55, 7, (234-239), (2012).
http://rus.ums.rshu.ru/file1626

Special thanks to Jeremy Dittmer and Douglas Merrell for their help with this video.