Not willing to admit any of the 'alleged' mistakes I (sorry I mean any 'friends' of mine) may have' inadvertently' made in a public forum, just encase they are used in court of law advice against me (sorry I mean 'him').
I do recall a 'friend' of mine was helping out another electrician during his apprentice, in which he was knocking into a brick to fit a socket (wall of adjoining house) and brick was working itself loose (unable to dig it out), when asking the electrician what he should do, he was told to just knock brick into the cavity and he'll be able to deal with. So tried knocking brick into cavity and but getting some resistance, expressed his concerns, and told just to hit f'en harder, which he duly did. Only to find a whole family was living in the cavity. Turns out only a single skin wall between houses.....a rather expensive fix....new wallpaper for the cavity family and compensation.
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North of border we call that doing a 'Begbie' - All makes sense if you've seen trainspotting - bar scene.