All right, I found another nice illustration. Some philosophers today think that Newcomb's problem is a model of certain real-world situations. Here's a typical specimen of this idiocy, retyped verbatim from here:

Let me describe a typical medical Newcomb problem. It has long been recognized that in people susceptible to migraine, the onset of an attack tends to follow the consumption of certain foods, including chocolate and red wine. It has usually been assumed that these foods are causal factors, in some way triggering attacks. This belief has been the source of much mental and physical anguish for those susceptible both to migraines and to the attractions of these substances. Recently however an alternative theory has come to light. It has been discovered that eating chocolate is not a cause of migraine, but a joint effect of some pre-migrainous state (or 'PMS', as we doctors say). The physiological changes that comprise PMS thus typically increase a subject's desire for chocolate, as well as leading, later, to the usual physical symptoms of migraine.

The article goes on to suggest that, in a sufficiently freaky decision theory, abstaining from chocolate can still help. Yes, folks, this is the best real-world scenario they could come up with. I rest my case .