To address some of the other possibilities in the other thread:
--- Lawn weed killers would not affect lilies in that way. Lilies are monocots, like grass. Overspray of an herbicide like Round Up that goes after everything is possible, I suppose, but unlikely.
--- Since the insects that would cause this kind of damage would usually be sucking insects and not the type that eat parts of the plant/leaves, you would not see anything "missing". But I don't think it is insects, anyway.
My best guess is something environmental, since it all seemed to have happened at the same time. A cold snap a week or so ago? I suppose insects could do this, if they damaged one side of the stem, but not probable, in my opinion.
At any rate, your lilies will be fine in the long run. They may look a little wonky for the rest of this season, though.
