World's Largest Vacuum on Wheels

We were foraging weakly for sustenance on our barren side of the stinging wire this morning when an amazing conveyance began beeping it's way down the driveway backwards. It was enormous and had an array of pipes and hoses draped all over it. It also had an intriguing aroma wafting from it's very core. We were enthralled and flocked to the fence to see (and smell) what would happen next.

Two male humans jumped down and began conversing with the woman. Then they went around the back of the house and began sticking a metal rod in the ground at about one foot intervals. We rushed to that area of the fence and leaned closer. They must have found what they were looking for because then they began to dig like two very efficient badgers. They dragged out a slab of something rock-like and peered into the depths.

By now I was nearly beside myself with curiosity and began to call to them plaintively to let me out so I could peer into the abyss. They misunderstood completely and simply laughed in an amused fashion. "Are you sure you're a donkey, little buddy, you look more like a beer keg on sticks!" they said. The nerve! And then Jack said something absolutely incredible. "Don't worry, it's just them guys what vacuums out the skeptic tank" The sceptics? They're kept in underground chambers? How utterly confusing - and disturbing. Why have I never heard of this bizarre practice?

They then dragged over an enormous hose which they stuck in the underground chamber and the vehicle began panting and roaring heavily. The air was redolent of - I'm not sure what, but it was certainly powerful and pungent enough to make our eyes water. When satisfied with their work, they replaced the slab and covered it back up with earth.

The woman seemed quite pleased with all of this and actually remunerated them for their services. I simply don't know what to make of it. Just one more thing to worry about, I suppose.