iPhone app: Hold On!

Developer: IMAK Creations

Price: $0.99

What can you say about an app that does nothing other than test your patience and/or intelligence by timing how long you are willing to hold your finger on a big red button? Hold On! has amassed more than 2,000 customer reviews on The App Store. The app itself might be useless, but reading the reviews is quite entertaining. Apple categorizes Hold On! as a productivity app and the developers are now charging a dollar for it, which only gives reviewers more material to work with.