Isaiah 20

"Then the Lord said, “Just as My servant Isaiah has walked naked and barefoot three years for a sign and a wonder against Egypt and Ethiopia,  so shall the king of Assyria lead away the Egyptians as prisoners and the Ethiopians as captives, young and old, naked and barefoot, with their buttocks uncovered, to the shame of Egypt." vv.3-4 

Read chapter 20
Very short chapter but three distinct events happens in these six verses.  One, Sargon's capture of Ashdod the Philistine city; two, Isaiah's three years of walking around naked and barefoot; three, Assyria's defeat of Egypt and Ethiopia. Crazy to think that Isaiah was three years walking around naked.  It's hard to say if this was constant or only when we went out into the city.  A sign that lasted three years still didn't cause Israelites to trust God.  This effort of extraordinary behavior to get the message across wasn't with words as he walked around naked but prophesied in act and explained later as a sign and wonder against Egypt and Ethiopia.  Focus was more on speculating what he did than what it meant.  The objective of this prophesy isn't so much the fate of Egypt, Ethiopia and Assyria but against trust in foreign nations and powers.  Verse six shows that it was too late to when they decided to believe Isaiah's prophesy.  When do you fix yourself more on the "image" than the message or purpose?