Anyone care to fess up to any embarrassing work blunders?
news.sky.com
Personally - many moons ago when tasked with fixing some mini trunking to a ‘wall’, drilled a hole to fix a self tapping screw in to a metal panel only to discover it was a radiator panel.
That itself wasn’t too catastrophic as we were able to isolate the feed, however the next day it appeared the heating had come on over night and back filled the system and ½ the ceiling had come down on the ground floor where the water had got into an adjacent riser
Was some big wigs office at BT too.

Worker sacked after calling customer 't***' in email mix-up awarded £5k
Meliesha Jones, an administrator at a curtain and blinds company, accidentally forwarded an email calling a customer a [Poor language removed] to that customer instead of a colleague.
Personally - many moons ago when tasked with fixing some mini trunking to a ‘wall’, drilled a hole to fix a self tapping screw in to a metal panel only to discover it was a radiator panel.
That itself wasn’t too catastrophic as we were able to isolate the feed, however the next day it appeared the heating had come on over night and back filled the system and ½ the ceiling had come down on the ground floor where the water had got into an adjacent riser

Was some big wigs office at BT too.