Recession Proof Businesses

Now I am used to reading news like "XYZ Corpn lays off 5000 employees; will sack another 4000". I was just wondering which industries are reasonably recession-proof and here is my incomplete list.

a) Temples. Well, I am not saying these are businesses. But as things become more uncertain, more people will visit temples. So expect more waiting time in Thirupathy, next time you go there.
b) Astrology. Precisely for the same reason, more people will go to astrologers, palmists and what not. Depending on the age, you can predict the nature of the problem. If he is not unemployed, it is about job; if he is employed, then it is about love; if he is employed and married, then it is about child; if he is old, then it is about health, and so on. I am incidentally pretty good in numerology. :)
c) Academics: As of now there seems to be no problem. But ever since the recession started, my annual income has almost come down by 40%.

Using Finance language, Temples and Astrology are zero-beta businesses. Academics seems to have a higher beta (particularly in management education).

You can add trivial examples like restaurants, entertainment, food processing, FMCG, etc to this.