With Pranksapp you can generate funny pictures to send to your friends via messaging apps like Whatsapp.

Choose two images: a preview image and a real image.
The application will merge them, creating a photo that will have the preview of the first image, but once sent, when it is opened it will change to the second image!

The app is very easy to use: just choose the images and press the "Create image" button: the app will do the job for you!
There is also a tutorial that shows how it works step by step.

Pranksapp is totally free: you can generate infinite images and you won't be asked to pay to unlock additional features!