FX keeps showing previews for next week - it's apparent that Liz has something happen to her after she picks up a chick in a bar. Today, the commercial showed more than yesterday about what happens, but I'll tell you straight out. She gets a call telling her "Don't move - the paramedics will be right there" or something similar. Then, she slowly looks down and sees a bandage and chemical ice pack on her side.
What this is, is the urban legend about getting picked up in a bar, getting a knockout drink, +/- having wild sex, then waking up with your kidney stolen, and an alert that something dire will happen soon ("die in 5 minutes unless you get help!" or the aforementioned paramedics).
Why this is such a joke is two-fold. First, what is immunologically and technically easier to transplant - a kidney or a liver? The kidney is a comparative snap to put in - hook up artery, vein, ureter, and look for pee within the first minute or so. However, HLA typing a kidney is specific stuff - you can't just yank one and put it in another, and harvesting it first, then finding someone who matches, does NOT work - the kidney is very unlikely unusable by the time a recipient is located. Comparatively, just the blood type has to match for the liver - but putting it in is a bear.
The other thing is, how logical? I meet you, you see my face, I drug you, you pass out, I (and colleagues) steal your kidney (or kidneys). Why, oh why, would I let you live? So you could ID me and I could spend the rest of my life in jail? No, I would let you die, and take my chances (since I've already assaulted and battered you, it's a done deal). It's easy enough that the renal arteries just need to be incised longitudinally, so that the muscular contraction that closes a transverse bleeder instead opens the vessel wider. You exsanguinate in 1, maybe 2 minutes.
So that's my peremptory beef.