Going after vandalism is one thing, going after April Fool articles is quite another.
Not really. Revert a few times (pointing out any descission reached on this issue) then block until midnight UCT if they don't take the hint (I'm aware that this could cause problems in the meta namespace but since that is pretty much admins only any descision on that should be respected) move to BJAODN if you feel like it just like any other silly vandalism .