I've been killed by chickens before so... yeah. I tried to place the blocks from different angles, they kept smashing. I closed down Minecraft, but when I tried again they kept smashing, the particles that come out when you smash things actually came out when it happened. I've had run-ins with Herobrine before but they weren't anything like this, so this is kind of weirder than you'd think. If anyone knows what happened please tell me.