Urine that is. Here's a video of a guy pissing on the conveyer belt at a Kellogg's factory:
Terrible: Dude Records Himself Pissing In A Kellogg's Conveyor Line! (*Warning* Must Be 18 Years Or Older To View) - World Star Uncut
if you ate Rice Krispies in 2014 you probably ate that guy's piss.