Great thread, Neo! 
I gotta put in my .02, since it's obvious we do the same thing (i.e., grind our brains on the same stone)
GAH! what a picture
#1)
The cup is half empty/full: Actually, my friend Paul figured it out, to wit:
The cup is merely half enjoyed! Pretty good, hah?
Other ones, though, are a bit more cryptic:
#2)
Nothin' from nothin' leaves nothin'. This is one from my childhood, in a mostly black neighborhood, and while I understand the
intent of it, it is almost impossible to quantify.

The INTENT of it is to say, if you don't make the effort, you'll be left with nothing. Fair enough, as far as it goes, but....
HUH???
But that's not so bad, though, not as bad as this one:
#3)
The early bird gets the worm.
Such nonsense. If you've been awake for the better part of the 20th century, you will have learned that
the 2nd mouse gets the cheese!