After several weeks of trying Swheatscoop litter and having accidents outside the box with our older cat Meeko I switched one litter box back to clay litter. I bought a different brand than what I had been using since the old brand wasn't absorbing and the urine was turning to clay muck. I bought Fresh for Life Multi fresh4life | Multi-Cat Formula. I just went downstairs to clean the boxes and found Richard (10months old) in the box. I left the room to give him some privacy and when I heard him stop covering up I went back in. He jumped back in the box and started rolling around, doing flip flops in it and generally having a grand old time. Is this normal behaviour? I have never seen a cat do this before. Any thoughts on this behaviour?