http://www.jerrysbaitandtackle.com/i...GA_EMaloch.jpg

Found this picture on a google search, hope it works, the caption with this picture reads:
"This poor buck's antlers grew downward and curved around to impale it's own jaw. The animal was not able to open it's mouth more than a half-inch, though he had worn grooves into his jawbone while trying. "
I wonder how much this effected his eating.