So, we were at WalMart a few months ago, and upon entering, the sight of about 15 employees sporting rubber gloves, buckets, huge handfuls of rags and assorted cleaning products made us stop and look. The gang was stretched out through the store, basically in a line leading from the front door back towards the automotive section.
Seems that one bright in-duh-vidual decided it was time to bring in his used motor oil. So, he poured it into a ten gallon garbage bag. Seems the first one started to leak, so he added another for protection.
The second bag didn't develop a leak until he walked through the front door. He proceeded to trail oil through the entire store, reaching the automotive department just as the bag released the final drop of it's contents!
The following week, upon entering same store, a large hand-lettered sign was posted "USED OIL MUST ENTER BY TIRE DEPARTMENT".