This is the best zombie ever! IMHO. The thing I enjoyed was that Shaun didn't even know what was going on. Also, SPOILERS I love the part when Shaun and his pal were singing a song drunkenly and noticed this guy was groaning, they looked at him and kept singing.
My favorite part of all was when they were pretending to be zombies. I don't know who came up with that but it is so brilliant. too bad the people in other zombie movies didn't think of that!