Newspapers and magazines that take personal advertisements often provide a reply forwarding service; in this case, the text of the advert will include a unique box number and anyone wishing to reply to the advert sends or delivers their reply to the publisher's address in an envelope bearing that number.
The publisher forwards replies in bulk to the advertiser at a given interval, for example each week.
At this point a man from a nearby cafe comes over and calms the situation down by paying the pharmacy owner for the stolen items.
The inspiration for their reveal is the invention of True Blood, synthetic blood developed by Japanese scientists which allows vampires to survive without killing people.
The trademark bottles are a regular fixture of the show, although there remains a large faction of vampires who oppose integration with humans and rarely drink it.
Eric and his sidekick, Pam (Kristin Bauer), don't exactly play by the rules when it comes to drinking blood from humans, though they maintain the guise of operating a True Blood-only establishment.
In the seedy vampire underworld, some humans enjoy being fed off of, and others are addicted to the healing, drug-like qualities of vampire blood and will do anything to get it.