We made a wit on Monday. We batch sparge in a rubbermaid cooler with a false bottom. The moment the valve on the mash tun was opened - STUCK. Immediately! Tried cutting the grain, scraping the false bottom with a long spoon, blowing back through the valve, stirring the mash, nothing would get it past a slow trickle. Frustration all around, wife was swearing like a sailor, it was epic. Finally, I stuck my keg dip tube brush up through the drain hose and through the valve. - THIS got it going, though I had to keep reaming it out to keep the line clear. So about two hours later than planned, we had wort to boil.
A few hours later when cleaning, I saw the problem. The hose that connects the false bottom to the valve came disconnected, so we were just draining through the valve.
*##&$&#*^$#*#)@($*
It's pretty hazy, looks like fermenting milk right now.