User blog comment:Rappy 4187/Technical Update: April 1, 2015/@comment-25240518-20150402155146/@comment-126761-20150402171941

Generally we leave it up to individual communities to play pranks - we don't want to interfere with the smooth running of any communities that aren't interested, which really only leaves us with Community Central as an appropriate place.

We might do something bigger on CC next year - we'll see :)