Mine does that with the water too! Won't touch it if it's been there all night, has to be fresh. He also enjoys knocking over my shavings fork and running his teeth along the metal so you get some strange noises!
Yep, mine loves the shavings fork for some reason! One of the forks has duct tape all over the end and he just loves to chew that. Also likes to pull my gloves OFF my hands, then fling them around the stable, picking them up, chewing them, and flinging them again. It is like having a great big puppy, not a horse. He will also do up (and undo) zips on your coat if he is particularly bored.