I've been watching a lot of zombie movies again. Last night's was the almost worthless 1979 film "Zombie," aka "Zombi 2." I say "almost" because it does include a scene of a zombie fighting with a non-CGI shark. Here's the video. You're welcome.
It's worth noting that in the scene immediately preceding this one, the zombie menaces a diver who is entirely naked except for a thong and scuba gear.