A recent r.h.f post reminded me of this...
I don't think this originates with him, but a psychology professor of mine
used to say something like the following in the neuropsychology section of
his intro course:
The hypothalamus is one of the most important parts of the brain, involved in
many kinds of motivation, among other functions. The hypothalamus controls
the "Four F's":
1. fighting;
2. fleeing;
3. feeding; and
4. mating.
(From the "Rest" of RHF)