Coup d'etat in Pakistan

1958 - Ayub Khan overthrows government of Iskander Mirza
1970 - Yahya Khan overthrows Ayub Khan
1979 - Zia ul Haq overthrows Zulfiqar Ali Bhutto
1999 - Pervez Musharraf overthrows Nawaz Shariff

QED:

2009 - Could Pervez Kayani overthrow Asif Ali Zardari ?