A crap job that involves breaking into peoples' homes and offering them crap they don't want. This includes phony vacation offers, annoying election information, shady fundraisers, and fake IRS scams.
You possibly want to avoid these if you're on the defensive side. This is made especially worse if you're an
entrepreneur, as you'll end up getting interrupted if you're in a meeting or
on the phone with an important client. These people give offers of wanting you featured in their magazine or newspaper, selling you their
college student app or coupon book, etc., just for the purpose of leeching cash from your wallet.
Is there a way to avoid these? Yes, just put up a no trespassing or soliciting sign.