Dumbstruck is an application that will allow you to capture the moment in which your friends receive from you a message. How does it work? Message recipients touch the Start button to read the news, then the application activates the camera and record the response. You can share photos on Twitter or Facebook. The application automatically deletes the contents after 24 hours, unless you decide to her behavior. Link to the free app
https://itunes.apple.com/us/app/dumbstruck/id713590482?mt=8