a brief gallery of obvious instructions

In an effort to keep any of us from hurting ourselves, some companies issue warnings and instructions that are painfully obvious. In contrast to the gallery of confusing instructions (below), here some instructions/warnings for the common-sense challenged:

(1) An apt warning from Marks and Spencer. (it is "advisable" but not necessary?)
(2) Instructions for those who use doorstops on the side of a door
(3) it is all in the little arrow







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