My wife found some water in the passenger footwell -- I went out assuming there was some dirt or crud in the drain line and it was backing up -- but discovered that the drain line had come loose from the bottom of the A/C unit. Water was just draining out onto the (luckily rubber) floor mat. The hose doesn't make a very tight connection so I am assuming that one of our large-footed teenagers knocked it loose (who knows how but I have stopped being surprised).
Some did end up dripping behind the floor mat so the carpet is wet -- so I have a portable fan going on it this afternoon.