1. Professional career consultants say the best day of the week to quit is on a Friday. A number of high-profile politicians have called it quits at the end of the week, a list that grew a little longer with the unexpected resignation of CIA Director David Petraeus, who revealed that he had an extramarital affair. 
  2. Friday, Aug. 9, 1974: Richard Nixon resigned as the 37th President of the United States.
  3. Friday, April 29, 1977: West Berlin Mayor Klaus Schutz resigned after a financial scandal
  4. Friday, Nov. 6, 1998: Then-Congressman Newt Gingrich stepped down as Speaker of the House.
  5. Friday, Sept. 29, 2006: Six-term Congressman Mark Foley, R-Fla., resigned after a scandal involving sexually explicit messages he allegedly sent to an underage male former page.
  6. Friday, Feb. 17, 2012: German President Christian Wulff stepped down after low-interest loan scandal.
  7. Friday, June 16, 2012: The head of Philadelphia's Housing Authority resigned after allegations of an extramarital affair.
  8. Friday, Nov. 9, 2012: Quebecois Mayor Gilles Vaillancourt, of Laval, stepped down amid corruption allegations
  9. Friday, Nov. 9, 2012: CIA Director David Petraeus resigned after revealing he had an extramarital affair.
  10. Correction: An earlier version of this story incorrectly included the resignation of a Watergate special prosecutor.