Yes, I have a weird horse. After some light work in the arena, i let him out back in the herd again. The first thing he did was to roll over a few times before he sat up and did this;
First i thought he couldn't get up, then I realised that he was scratching and was enjoing it aswell! Look at his muzzle :D
And he didn't want to wait for the water, ice is the same thing, only frozen !