What is Reddit's opinion of ViralCam - Change the reality?

From 3.5 billion Reddit comments

ViralCam lets you put yourself into any picture

Hi guys, I am a developer of a recently published Android app called ViralCam. With this app, you can Photoshop yourself into any picture (see pics at google play) and the good thing is that you can see yourself or your friend in the picture while you are actually taking the picture. I was trying to make it as easy to use as possible, you just need to roughly mark the edge around you or whatever object you want to put into the picture. Unlike with the Photoshop Lasso tool which can be a pain in the ass for inexperienced users. The app should handle semitransparent objects (hair and more complicated stuff). I believe that the community could benefit from app, you can troll/fool anyone :)

I am just curious, what do you think about it? Any feedback is welcome. Have you ever wanted to create something like this, do you see a use for the app? What would be your first "fake" image? I would be really glad if you shared your results :) (you can tweet them to @SalatMarek for example)

side note: I have created this app because I wanted to try some cool algorithms for image matting (foreground detection from a single image) and this is just a Minimum Viable Product (MVP). Any feature you want to add can be added. The ultimate goal is to visualize the final composition in real time. Imagine you run the app and you select a background picture that has your favorite celebrity in it. You would see yourself in that picture (real time), you could adjust yourself to better fit in the picture. Once you feel you nailed it, you just take the picture and share it, would that be cool? At the moment I do not know if the real time aspect is really that important for the app and the current solution actually may be sufficient. What do you think?