Sorry I don't have a screenshot or picture, it was funny and unexpected enough that I didn't get it. If Icehowl targets you for his charge in ToC 25 hard mode (and I SUSPECT, but can't PROVE other versions), you can iceblock and he will stun himself on the ice block.
Totally unexpected, had us all laughing our asses off in ventrilo. He charged, the mage ran straight toward him and then iceblocked, and icehowl ran smack into him and got stunned. He did NOT hit the wall, he was actually almost in the center of the room.
If one of our mages does it again next week I'll try and get a screenshot.