While Apple's Photo Booth and iPhoto '09 both have features that let you apply wacky effects to your friends' faces, they also both require that you be at your Mac. As much time as I spend in front of my computer, I'm often found in front of my iPhone, too. So wouldn't it be cool to be able to muck around with their mugs while you're waiting in line for coffee?
An Italian software developer, Ab2Labs, has just launched Face Fun, a new $3 iPhone app. Select a photo from your library; the app will detect the faces and then you can create various effects, including creating a puzzle or inserting that photo into other pictures.
Words are too cumbersome to describe all the various wacky options—just scope the YouTube vid below for the full effect.