We can say it was just a lucky day for the mining pool 'ethermine', that reward divided between all the miners means a big a mount for all of them even if they had a low hash power. This makes me think about how good could it be to have a small mining hash power on each mining pool, this way we could get some of these jackpot fees.
I wouldn't touch the money if I was part of the miners... It's worth alot for such risk. Will keep it just incase the owners demand for it. This kind of issue is one of the reasons i think miners need to have unique form of identification (while still being anonymous) with reputation or trust system. That could make retrieving such money much easier.
Hope it's not an attack, or software/security issue. Or just a joke?