Ianto chuckled, still amused at the fact that the three of them all asked the same question about the hole. "No one's ever fallen through, that I know of. You kind of have to lure someone over to the spot in order to do so--otherwise they'll just avoid it out of habit. We did end up having a cat fall through once, but..." he trailed off, looking sheepish, "that...may have been my doing as well."