I was on my mage messing around and i noticed everytime i entered hall of honor in orgimmar (place where you buy pvp honor rewards) my Frost Nova/Cone of Cold/Ice Barrier cooldown would reset everytime i entered the instance.
I think it works on any instance and maybe only with skill cooldowns under 30 seconds, but yeah i just thought it was wierd. And if anyone had any ideas how to reset all cooldowns~