OK, so working as a security guard at a boring site you learn to entertain yourself and hopefully the person you work with. Couple that with the homeless problem we have at the site, craping in the stairwells, pissing on the walls, picking through the trash and leaving a mess, harassing tenants and contractors and just being mental instability combined with a body odor that would choke a wildebeest. I lost sympathy for these shells of people a little while ago when nothing seems to change unless intervention is made and thus Yum Yum Bag.
So this all started last week, Saturday, while I was doing my normal patrol around the plaza. I usually check the bushes for whatever and I found a black bag, I hate this shit, I dont like it when people leave trash on my site so I grabbed the bag and threw it into the middle of the walkway and made a sign that I thought was pretty good. It said "If I find this again YOU will not" simple, effective, but my coworker thought it was a bit too direct and he favored something a bit more . . . . . WTF inducing and less direct I suppose.
So the Yum Yum Bag. A bit of duct tape, caution tape, paper plates, a fork a knife, a paper cup with 35 cents inside (just because) and at the center of it; the hobo bag.
The result; people walked by and seemed perplexed at this thing but it is SF and was generally accepted we dismantled it before our shift ended and left the bag on the bench where it sat . . . . . until the next morning when some punk kids showed up, opened the bag (which neither me nor my partner wanted to do) found nothing valuable inside and left it and left it be. Then the janitor showed up and unceremoniously put it in her trashcan cart thing.

TLDR; HOBOS! DONT LEAVE YOUR CRAP ON MY SITE OR I WILL BE FORCED TO DO THINGS LIKE THIS DO THEM.