Depends... I have a mischievous streak in me, so I tend to get all excited when solicitors visit. I have a back door and front door, so I go out the door they didn't knock on, and tell them to something of the of the effect of "hey, you know, a suspected serial killer lives in that apt." or "the last three people I've seen go in there have gone missing."
I also only answer if it's cloudy, or when it's dark out (I keep in dark in my apt, and it makes it hard for them to see my face).
Family and relatives I'll never answer to. Actually, I'll exit the apt at the first chance, take a car and zip out of there without being seen.