Praise Someone You Know She Has Issues With

All women have major insecurities about at least one or two other women. It could be their sister, their cousin, a friend or a colleague--and chances are you're very well aware of it, even if she doesn't think you are. They're as transparent as a sheet of plastic, the fairer sex, and it's time to take advantage of it! 

Praise this person, albeit as casually as possible, and watch her patience levels drain right in front of your eyes. This one's a bit tricky though, because you might make her angry instead of jealous if you push too hard and for too long. So keep it simple, short and utter the words almost in passing if you want the right results.