Your glass can never be half empty. Since empty implies devoid of content, unless you create a perfect vacuum in half your glass then it's always either full or half full. Sorry pessimists. Although if you're filling a glass and stop halfway it is surely half filled and if you stop halfway through emptying it then it's half emptied, assuming you intend to continue emptying it and not start filling it again at which point it becomes half full. Again.
I took the piss out of @Arquebus in his falling down the stairs thread, then promptly fell down the stairs :Eggonface::Facepalm: carpet burns on arm and leg :Arghh: