Let's see here, black shirt, and drip stains as it traveled downwards. Most white foods don't leave such a strong stain unless you leave them there. But even then, at some point you notice it or wipe part of it off. The only thing I can really see it being is some kind of work related solvent or paint. When I worked in construction, for about a week or so I painted over concrete with a waterproofing layer. Now, I leaned my head up against the wall accidentally and got black shit all over my helmet, which proceeded to drip down onto my work suit or elsewhere. However, working outside in any kind of black clothing is suicide unless it's cold outside. So, now I figure it's some kind of iced drink, like a vanilla something. And, for the sake of the obvious, it's [i]obviously[/i] horse cum.