No private parts are seen but he does flip the bird. Hey man I don't know what your office is like. I watched this super short video and thought, huh then at the last second something happens that had me blowing extra air out of my nose.
Let's just all agree that zombie walks are stupid, OK? Adults dressing up like zombies and walking around a city is kind of silly. But when it comes to Comic-Con International 2014 in San Diego, anything goes and things like this are pretty commonplace.