Glass Shootout
Lets you shoot around at things using the gyroscope on Glass – this evolved into gyroFIRE.com (and a more useful computer vision version that recognizes blobs around you called Reality Tagger)
http://prezi.com/qlafsggzsv3n/native-apps-for-google-glass-and-a-few-fun-app-previews/
Demo’d at DEFCON and SXSW