A noun often used to describe the apocalypse of the Earth - proven by Monty Python and the Holy Grail and agreed by psychiatric madmen. Spelt in capitals to explain the inexplicable evilness of it. Sometimes followed by an twisted grinning emoticon.
Some Guy: Hey, how about dinner tonight? 8pm at L'Élégant Alimentaire?
Some Gal: Awww look! It's a cute wittle bunny wabbit!
Psychiatric Madman: ARGH! IT'S A BUNNY!
Some Guy: Hey dude, why don't you...
Psychiatric Madman: I told you so...I told you so...the BUNNIES are coming...