Remember your local Boy Scout food drive. Mine is this Saturday the 22nd. You should put some food (non-perishable) in a bag by your door so the Scouts can come and pick it up for the local food pantry or Dear to Care etc...
My advise and what I always do is: Wait inside by the door and when they reach for the bag SMACK THOSE LITTLE FUCKERS IN THE HEAD WITH A FOUR POUND SLEDGE.
The down side is after a couple of years the scouts get wise and stop coming to your door (unless you get a really dumb one) but that's why it is important to use non-perishable goods. You can retrieve them and nothing goes to waste.
If you're a girl (or just a pussy) I recommend a 24oz Estwing framing hammer. Sorry, that's sexist and I shouldn't say that.