We've got three slabs of just-poured concrete, fresh this morning, in our yards. One's in the front and right next to the street, the other two are in back.
I checked the front slab when I got home, and then, appalled, checked the two in back. It was the same for all three.
What was there? Nothing. Three perfectly good slabs of wet concrete sitting next to an elementary school all day, and with the exception of a couple of halfhearted footprints in the front yard (and those were right next to the street!) there wasn't a mark on any of them.
Kids these days.