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

Here's Apple's "slide to unlock" patent:

http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8,046,721.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.