How to Piss Off a Girl

Ever wonder what it takes to make a member of the 'fairer sex' angry? Well, first of all, call her the 'fairer sex.' Well, the Twitterverse wanted to know the same thing, so the topic #howtopissagirloff was launched.  Hopefully some of you will be enlightened - or at least entertained - by the responses.

What are some of the ways you can think of that will set your lady friend off the deep end?