input: [0] 5. [Event] UserA finishes his mashup and creates a basic App with it. He turns caching on for his mashup and assigns an expiration period of 15 minutes. UserB uses this App. Three minutes later, UserC also uses this App. [Cache Entry] 
output: The mashup is run and caches its response when UserB runs the associated App. The mashup also runs the Yahoo Financial mashable and that response is also cached. When UserC runs the App three minutes later, the cache entry for Yahoo Financial has expired. The App, however, simply uses the cached mashup response which is based on Yahoo Financial results from three minutes before that may now be considered stale.