Do You Answer The Door?

It's 6 O'clock at night. You have just finished dinner and are trying to relax and spend some time with your family. All of a sudden there is a knock on the door. You peek out and see two guys in suits riding bikes. You already know.... damn, it those Jehova's Witness'. Do you open the door and talk with them nicely, do you curse them? They can see the light on and hear noise so they know someone is home, but do you try and be very quiet and slowly walk away giggling. Do you feel guilty not opening the door? I brought this up because I live in an apartment complex were soliciting is not allowed. And I overheard a neighbor of mine open his door shouting curse words and telling them "no soliciting." I felt bad for the kids, and at least gave them a chance to speak, I told them "no thank you" and I already have a religion I believe in." What do you do?