This is my second favorite joke, and it works much better if you bring it up in conversation as a true story.
So, my sister has a maid who is an illegal immigrant from Mexico. Even though neither speaks much of the other's language, they become pretty close. So, it was no surprise when her maid came for help -- the maid's son, a little six-year-old boy, had been playing on some old crates behind their apartment and had injured himself very badly. His leg was cut, and it had become infected, and it wouldn't heal.
So, they take the kid to the doctor, where they run into serious trouble. At first the doctor refused to treat the kid at all, complaining about dirty Mexicans coming in illegally and such. It took over an hour to finally get the doctor to take the case. By the time things came to surgery, the boy's leg had to be amputated. But the doctor was so agitated (and, as court records later showed, intoxicated) that he prepped and amputated the wrong leg. His mom came back the next day, finds the boy with a missing leg and an infected leg, freaks out, takes the kid to another doctor, who amputates the correct leg.
Even though she was an illegal immigrant, the boy's mom wanted to sue the doctor. It was a very complicated case -- she was illegal, and so was her son, and the doctor was never paid for case which he had agreed to do under the table since the woman was so poor, and so on.
Finally, they got to open court, where the judge promptly threw them out. It turned out that the boy's case didn't have a leg to stand on.