Well, It wasn't that interresting, dinner that is. Just some pasta, turkey, and grapefruits with some hot salsa sauce.
But seriously. PCV is short for ; "Positive Crankcase Ventilation". Most often it comprises of a one way valve that emits surplus (oil) vapours from the crankcase. However the outlet is often fitted to the rocker cover. This one way valve relieves surplus pressure into the intake system. One thin hose is routed to the intake plenum, after the throttle butterfly valve, and the thicker hose is connected between the throttle body and the AFM (if fitted). The thing is, if the hoses were the same size the vacuum behind the butterfly valve will suck the PCV valve open, and thereby sucking oilvapours. Not a good thing, as this will cause excessive oilconsumption.
Many supercharged or tuned cars have a problem here, because the intake is sometimes pressurized, sometimes it's in a vacuum state. So most Tuners chose to install a small filter on the Breather hoses instead, and plug the connections.
Hope this helps, and I'm not talking MumbleJumble.