Our app got just released on the appstore, just in time for halloween. 
http://itunes.apple.com/us/app/halloween-horror-heads-demons/id399851555?mt=8
Its also available for android: http://www.appbrain.com/app/halloween-horror-heads/com.tocogames.HalloweenHeads
It features 2 different 3d heads. They both have normal map and lighting baked in the diffuse texture and play various animations and sounds to scare you. The heads can appear differently and look like they come out of the screen. With tilting the device you can look around a head while its eyes keep watching you. Furthermore traditional 3d glasses can be used which makes it look like the heads come out of the screen even more. There are also several interesting illusions and effects that will keep the victim you like to scare focused.