YAPH wrote:
Then went into the kitchen next door to put the kettle on and realised
that an entire run of tiles on the other side was lying on the floor. The
tiling was hollow-sounding anyway, and the drill bit had just gone
through the 75mm block wall on each hole!

The previous owner of my house 30 years ago was putting
cupboards up in the kitchen and drilled the requisite holes
and pushed wallplugs into them. A few minutes later her
neighbour came round to return the wallplugs that she'd
discovered in /her/ kitchen.

JGH