I know some folk will have seen this but there may be a few who haven't so here it is again
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A psychology instructor had just finished a lecture on mental health and was giving an oral test. Speaking specifically about manic depression, he asked 'How would you diagnose a patient who walks back and forth screaming at the top of his lungs one minute, then sits in a chair weeping uncontrollably the next.
A student answered, 'A football coach.'