Scientists Have a Sense of Humour?

Short answer, YES.

Check out the URL.  If you can't read it (and it is hard to read since it's so small,) it reads http://www.hasthelhcdestroyedtheearth.com/

By breaking those down to American English words, we get "Has The LHC [Large Hadron Collider] Destroyed The Earth"

I expect that this site will be updated periodically.  Except, of course, in case the world actually does end and there's nobody around to maintain it.