I'M NOT SURE WHY

My office is literally on the roof of a building in North Beach, and to get there I have to climb three flights of stairs and walk on the actual roof for about ten feet, on top of a kind of wooden catwalk/path thing that starts out with a rug. Something I've noticed is that when it rains, the rug (obviously) gets soaked, to the point where every time it gets trod upon, it squishes out a little water. Something else I've noticed is that it feels really, really gross to step on it for some reason when it's in this state, even though I'm wearing shoes. I don't really know why; I guess I'm just a dainty, dainty princess.