Overheard:

lightistoobright: do you have mental problems?

Alas, Swing Dancin' Amy is partially correct. Not that I have mental problems, but she was referring to my contention that if you turnd a square manhole cover diagonally it would fall right through. This was poorly-worded and should have read: "tilted a square manhole cover upright and then turned it diagonally so as to align the edge of the cover with the diagonal of the hole".