The New York street artist known as Jilly Ballistic has been hard at work lately. Guided by her eye for bad ads pushing equally terrible products, she’s formatted her cheeky, pitch-perfect remarks into OS warning messages and plastered them on posters around town. Featuring iPhone alerts, low battery warnings, and error notifications, these geek-culture icons couldn’t be better-placed.

Images via Jilly Ballistic on Flickr.