Found on a friend's doorknob and doorstep, a half-gallon bottle of spring water and a doorhanger saying, "Hi Folks, I'm your neighbor's water man. I left you this half gallon bottle to introduce you to delicious Pure Flo Drinking Water." A coupon then offered a free sample case and more information. Punch line: My friend tried the water, then signed up to be a customer. Sampling works.