Writelike Shakespeare: Macbeth's 'Tomorrow' soliloquy

At it's heart, this passage is about about disappointment with life.

The snippet breaks down into:

• The experience of life—how does it feel at its most disappointing? 
  • (It feels like a creeping petty pace of days.)
• Where it ends—where does this experience lead?
  • (It leads fools to make bad decisions until they die.)
• A metaphor to capture this—what is this all like?
  • (It's like a poor actor who walks onto a dark stage, makes a big noise for a short while, and then disappears.)
• Another metaphor, extending on the first—what else is this like?
  • (It's also like a tale told by an idiot, full of sound and fury, signifying nothing.)

So to get into writing our own version of this, let's choose something we can express extreme disappointment about.

What is something you have been or could be disappointed in? (Or an imagined character—you don't have to write from your own point of view!)

You could choose something big, like life, death, infinity etc—but your variation will likely work better if you choose something smaller and more concrete, even trivial and mundane.