August 13, 2010, 6:25 AM —
You've probably heard that teenagers are capable of hearing frequencies higher than those that adults can detect; some stores pump sound at this pitch out of speakers to prevent teens from loitering out front. Well, with the Annoy-A-Teen app, if you have an iPhone 3G or later, your speaker can produce just this sort of noise, so you can irritate the young (and the young of ear) wherever you go.
What's the most useless, crazy, I-wouldn't-buy-that-if-it-was-free app you've seen? Tell me about it in the comments.