Scary 3d Objects Appeared

So i wanted to see the brand new 3d textures e.g. 3d rails, bookshelfs, ladders, plants. on snapshote 14wa10c but when i started it the game froze and then i waited to see if it would respond again and when it went back to normal it said on the minecraft logo: minesraft and i though it was just an easter egg or glitch. so when i started up a new world i decided to make it a flat world and on the menu with different flatworlds it said on one of them: 3d sworld. so then i pressed it but then it generated a world with red wool and blue wool as that represent the colours of 3d glasses. i placed down a book shelf but on the book shelf it said die. and on every 3d object i placed it said die on it. after that i closed minecraft and opened it again and it still did the same thing. so i looked on the internet but there was nothing. i went back on the game and started another world.and still the same things happend even if i didnt go on the flat world 3d sworld. i continued to play the game on the world i first ever played from when i first played minecraft the objects that use to be 2d and turned into 3d still said die on it. one of my friends started calling me on skype and i said to him: do you know anythings about this: then i started explaining to him what happend and after that he said how about you downgrade to 1.7.4. so then i did and its all fixed now. can anyone please tell me if you got this oh yeah and image for this post is from internet and i edited it to put die on bookshelf