I went into a creative superflat world. I found a village with an Iron Golem. At night I hit a villager and an Iron Golem started to follow me around.

I thought it was going to try to hit me or that it was just a coincidence that it was following me around.

What actually happened was when the Golem got close, its arms started to move at a very fast speed and it started to play the sound it makes when it swings its arms over and over and over. It was almost like it got its arms to the top of the swing but the reset back to the original position they are normally in.

I do not know how to reproduce it. I tried it in another world but couldn't get it to work. I'm thinking the game just messed up or it could just be a glitch.

Below are some screenshots taken as fast as I could.