My husband's not a moody person, but he does get lost for long periods of time, deep in thought. One time, the distance lasted for almost a week, and I began to get really worried. It took a lot of prodding, but finally he sheepishly admitted that he had been mentally building a fountain on our front lawn. We had never even discussed such a thing, nor do we have room for a fountain, but somehow it crossed his mind and stayed there, and he had become lost in this invisible project!

The next time your friend is in one of these extended moods, try asking him what world problems he's solving...it might help open the door to his world.
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When you don't like a thing, change it.
If you can't change it, change the way you think about it.

(Maya Angelou)