Ever tried drilling breeze block? Not the soft variety, but the really dense ones that weigh a tonne. Yes, you've been there before, I can tell...
You mark the exact spot you want to drill, bring the masonry bit into contact with the marked spot and, on the drill starting to rotate, the bit skitters around and starts a hole about half a centimetre from where you made your mark.
No amount of repositioning the drill bit works - it returns to the position it chose, or skitters off in yet another direction of least resistance.
In an attempt to place the hole exactly where you want it, you end up creating a hole 10 times larger than the one originally intended, or totally out of line with the other one you drilled, which is also about a centimetre from where you actually wanted it, but in the wrong direction.
The result? A totally wonky cupboard, or whatever you're trying to hang on the wall.
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