One of the things I realized is that if you are true to yourself and you say anything that is "wrong" that person wasn't going to be a good match for you anyway. It helps to do less talking and let them drive the conversation.
What I meant was that I will say something that comes out the opposite of what I intended. When I go up and try to introduce myself, it tends to come out something like "habahabahabahaba." That's assuming. of course, that I can force myself close enough to say it. It is my understanding that this is a particularly ineffective pickup line.