OMG A SQUID!
It was just an average day on teh3l3m3nts... I was working on my Sky Coaster, and Kirby was collecting stuff from the mob grinder. All of the sudden, Kirby told me to go to the grinder, so I did. This is what I saw:
The mob grinder spawned a squid! Isn't this the best thing ever? I mean, what are the odds? Well, I'm off to kill the squid now. Just thought you guys would like this!
UPDATE:
Apparently, it spawns squids a LOT. Sometimes it even gets glitchy and tentacles start reaching out of the walls.