My head scrunches!! Why?!?

Today, and random times in the past, I have heard a sort of scrunching noise in my head! It doesn't hurt or anything, but does anyone know wot it is? It just randomly happens when I move or tilt my head.
Answer:
Do you even get a clicking sound with the scrunches? I get both sounds because of arthritis in my spine. When I move my head the arthritis in the upper vertebrae grind against each other and cause these noises. You should talk to your doctor about this.

---

Does it happen after swimming? Could it be water trapped in your ear?

---