So this app does nothing but cause silliness.  I’m warning you now.  I’m pretty sure my husband got this app for our son but I know WE ended up playing with it a lot more than our son did.  So here’s the gist…you talk to Carl and Carl repeats back what you say to him in a funky voice.  Very simple. I can’t tell you how wide eyed my son was listening to Carl repeat back what he would say to the iPhone.  It was hysterical!