I'm impressed by girls that can make me laugh, especially when they can successfully one-up me at my own joke. I like pushing the envelope and when someone can push it a little further, I feel an instant connection to them.
I don't like people that are easily offended or intimidated. I believe you only live once so you should do whatever it takes to be happy with yourself and others. And be yourself, there's nothing worse than someone that acts a certain way because of others' judgments.