Do The Mormons Ever Come Around Your Neighborhood?

Just had two Mormons (they had the white short sleeve button up shirts with dark pants carrying a bible) knock on my door (well I say just, but it was about an hr ago). I was in the living room and the front door is near a window that you can lean over a little bit to look inside. When I saw them coming up the driveway I decided to not answer the door. They knocked, they glanced into the window and they likely saw me. My dog was on the back of the couch barking.

They knocked again and waited for a moment, then I saw the other one look in the window and he had a pissed off look on his face.. Then they finally walked off. I hate when people knock on doors to "spread their message", but what's the deal with these Mormons? That must suck to have to go around and knock on doors of people who don't want to talk to you.