damn it is indeed a prank gone bad.  it's just not the kind of a joke that we'd laugh at when there are private keys that will be publicized. there are still newbies out there. one of them even copy-pastes his private key upon joining a bounty campaign. 

the one that i was very amazed at was Brainboss Vacsino campaign. it's harmless but it's an example that some users aren't understanding what they read and will just post whatever is asked.