I was playing ClassiCube on Singleplayer, and started building a cobblestone hut on fire. Once I finished building, I saw a mysterious figure that looked like the ever-so-famous Minecraft legend Herobrine, but with a silly face. Luckily enough, I was able to take a screenshot.
Look at the figure on the right! I think it's called Berohrine.
When I started going for it, the figure disappeared, then I started placing saplings, and then stumbled upon a crown-like shape made from sponges.
Suddenly, a purple liquid spurted out of the disk drive of my computer, and then I thought "Since when did my computer have the ability to eject liquids like that?" But then, I continued playing. I went to a rose patch, but when I took a closer look, there was another "Berohrine" entity coming for me, so I decided to fly away from it. And so then, I generated a new world, with the Large option.
About that other "Berohrine" entity, it looked like it had been foaming out purple liquid, as if it had lean-rabies, and it had a purple cut on it's torso. The eyes also seemed bigger, and a wider grin for the smile.