The Walking Dead and its hero, Daryl Dixon, have really popularized the crossbow. It's a powerful weapon and it seems like the perfect tool for wiping out Zombies quietly.
However, if you aren't careful with a crossbow, you can lose fingers, arms, an eye or even your life. That's why I'm posting this link to a really good article on crossbow safety:
Field & Stream - Avoid unpleasant and dangerous crossbow shooting mistakes
I'm also posting this article from Inside Archery:
Inside Archery - 15 Crossbow Safety Tips
It should go without saying, but all weapons are dangerous and you don't crossbows are dangerous. They are made to inflict serious damage to targets, big game animals, mounted knights, and even zombies. Be careful!