Axolotls spin when on waterlogged blocks that have a water source block in them.

So if you spawn a axolotl on a waterlogged block with a source block of water in it, axolotls will start to spin in the on land animation. Not a big bug just something I discovered and found funny, I saw other bugs similar to this on the site. It is easy to remake just put down a fence, place water in it, and put spawn a axolotl on top of the fence.

NOTE: Neither the fence nor the axolotl need to be surrounded by blocks for this to work.