It's unoriginal I know but I'd take zombie apocalypse, if only to test the effectiveness of the contingency plan for such an event that my flatmate and I came up with when bored one day.
I have my doubts about the structural integrity of the front door, it being mainly made of glass, but that aside I still reckon we have a fairly cracking plan.
Of course should the event ever occur trying to find an audience who are suitably impressed with our ingenuity and foresight will probably be fairly tricky. Ah well, such is(/was?) life.