No, not David Cameron. I'm talking about the human appendix. When it's healthy, it doesn't seem to do much at all (apart from possibly re-stock your gut with good bacteria after you've shat or spewed them all out), and when it gets sick it can kill you.
I've just had mine removed, so there is now no danger that it will try to kill me. I may need to eat yoghurt more in the future, but apart from that there seems to be no other downside.
How do you know if you may have appendicitis? I had a sharp pain in the lower right abdomen, and it didn't go away overnight. Went to the hospital in the morning and saw two doctors. One said probably appendicitis, one said probably not. There's a palpation test they do as the first test. They press hard on the spot where it hurts, and when they stop pressing, the pain is supposed to get worse. Mine didn't, hence the contradictory diagnoses. Second stage is blood and urine tests. Blood in the urine or increased white blood cell counts can be positive indicators, but again my results weren't clear. Normal urine, and only very slightly raised WBC count indicating a possible mild infection somewhere. Stage three was an ultrasound scan. This can show an enlarged appendix, unless of course, like me, the useless little organ is hiding away behind the large intestine where the ultrasound can't see it. Stage four, then is the CT scan. You swallow a couple of bottles of liquid over a period of an hour, and this fills your digestive tract. Into the CT scanner, and you can see the high contrast liquid all the way through your system. If there's liquid in the appendix, it's not blocked, so the pain is probably something else. But if there's no contrast liquid in the appendix, you have your diagnosis - a blocked appendix and the little bugger has to come out.
Two hours later, I was coming round slowly in the recovery room. The next day, the surgeon showed me a photo of the offending organ, swollen and bloody on the OR table. Gotcha.