Everything flows, but only the macromolecules are worth the time.
Since Xe is big for an atom but still small, it may be just the right size to fit into some sort of pain receptor - adsorbing via nonspecific VdW interactions but effectively having a specific (i.e. biological) interaction.
The brain reacts weirdly to small greasy objects. Nitrous, obviously, and halothane, CF3-CHCl2, is/was a standard anesthetic. Heck, at high pressure N2 becomes narcotic. Deep or long residence divers have to replace it with He. In this group Xe isn't too out of place. I wonder if there have been any animal studies on Rn?
I just checked and halothane is actually CF3-CHClBr. Wikipedia also notes cyclopropane as an anesthetic.
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