Vague software patents which are equivalent to "patenting the wheel".

Here's Apple's "slide to unlock" patent:,046,721.PN.&OS=PN/8,046,721&RS=PN/8,046,721

This patent, although approved, was rejected when it was used in a courtroom against HTC. Many companies are wasting money on patenting stupid and vague things in order to harass small startups. When you can't make do - sue.