Zombie School was on the App Store for a week and a half before being taken down. The app had users shooting and grenading zombified classmates at a dilapidated school. In light of the negative connotations to school shootings, Apple took it down, however it took a fair round of press which began with its discovery by blog iPhoneWorld.
Zombie School developer Retarded Arts bounced back though. A month later the company re-released the app as "Zombie City" which was otherwise identical to Zombie School, although instead of being at a school it was in a city, and the characters were made to look less like children.