Greece just shot themselves in the foot.
I don't know how much the rest of you know about German culture (I'm an expert), but work ethics and punctuality are huge parts of it. It's not like it is in Southern Europe where you can get by while being a lazy bum. If you screw Germany over, you bring German rage onto yourself, and the only way to get rid of that rage is servitude.
What this means is the German public, after hearing about this, is not going to want to bail out Greece again, nor will they allow them to default on their debt. This is HUGE. You can laugh all you want, but Greece has brought the entire German military on themselves with this move.
Greece, publicly apologize and ignore the referendum results or you can kiss your Mediterranean islands goodbye.