In case you dont have a mic or you are too scared to yell because you are surrounded by zombies, you can also throw a tin can up our roof or something similiar that doesn't smoke. We also provide premium automated zombie killing service in our shelter with 99% safety warranty (once you are inside). Also: even though our service is free, we are always glad to have people bring us usefull stuff as payment, like medical supply they don't need, or maybe sometimes a drink or two.