It amazes me to find so many people creating some funny, silly and some cool tricks with their iPhones. One is the Touch Guitar Shinya Kasatani has developed PocketGuitar, a native iPhone virtual guitar. Available on Installer by adding https://podmap.net/apps as a source under toys. Complied some of the funny ones here. Always fun to see what people are doing with their iPhones.
PocketGuitar – A Virtual iPhone/iPod Touch Guitar
iBug Creepy iPhone Trick