Around 12:30 pacific time tonight (August 26) there was very "Spooky noises" when I was at spawn. Some were saying it was mass dragons or withers. But Right when it happened I started getting these weird visual glitches. I'm positive it was client side but I just figured I should share these screens, since some people thought I may have been drugged...
I bet it was vertex shading and vertex point arrays screwing up because your GPU ran out of cache space.