If you can make them laugh you're in.
Also don't go to the free clinic, make an appointment with a regular doctor. The free clinic, unless something has changed, will use the cheaper and older route of sticking a swab in your pee hole. I went to my regular doctor the one time I was tested and they said they don't use that method anymore, and I only had to piss in a cup and have a few viles of blood drawn.