If you have an alchemist, full moons can be a great chance to make friends. Prepare a bunch of jars of Potent Friendship and a bunch of potions of Cure (you don't need potent cure) and when the zombies show up, it's Rule #2: double-tap! Just be sure to hit them with the friend before you hit them with the cure, as they run away after they've been cured.
Unfortunately, while they're zombies, you can't invite them inside, but I'm curious about what happens if you're throwing a party and Invite All Inside comes into play...