Zombies drool.  Zombies smell very bad.  Zombies are notorious for bad hair do's.  Zombies are self-centered and violent.  Trust me, when I tell you a zombie is one of the worse things you will ever encounter.  A zombie does not stagger or crawl but moves slowly because it's muscles and tendons are rotted away and attempts at quick locomotion would cause a zombie to come apart entirely.  The smallest actions often require supreme effort.  A zombie lurching awkwardly toward its target is tantamount to a person with a severe disability.  If a zombie is legless , it crawls like a nightmarish inchworm.  You must disarm the zombie.  Especially if he has a samurai sword or a nail gun.  Those things hurt  something awful.