Putting your hands in your pockets is less effective than a harness at preventing falls but it will save you breaking a fingernail if you do chance to tumble
Thanks go to Guy Milton, who sent us this image of some men working on the roof of a block of new flats, laying the ply sheeting.
![Men on wooden rafters](https://d2vhdk00tg424t.cloudfront.net/MediaLibrary/s3/ubm-library/web/s/o/q/Blunder_wooden_mountain.jpg)
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