In the "Marvel Zombies" series, a zombie virus infects the Marvel heroes, turning them into cannibalistic monsters.
During the events of the "Marvel Zombies" storyline, Wolverine does indeed rip off The Thing's face, leaving a gruesome hole in his head.
It's important to note that this was a very controversial moment in Marvel Comics due to its extreme violence and the disfigurement of a beloved character.
If you're interested in learning more about the "Marvel Zombies" storyline, I'd recommend searching for "Marvel Zombies" on the internet or checking out the collected editions of the comics.