I have several items of clothing for which their dark colours could run on washing.

Some have a warning label in that says 'wash dark colours together'. Some have a label that says 'wash dark colours separately'. These apparently contradictory labels actually tell me to do the same thing, when context is taken into account.

What other examples are there, either out in the wild, or that could be constructed, of opposite messages meaning the same thing?

closed as too broad by Barmar, NVZ, k1eran, user66974, MetaEd Jul 28 '16 at 19:45

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