This Friday morning I caught the 6am train to work. In it were lots of tradies and most of them were half asleep in their seats. Immediately I thought of this thread and wondered what cockups they would unintentionally create for the day.
You can't stop humans being humans.
The folks working on the flap system failed to insert and secure a "keeper bolt"
In Chuck Yaegers autobiography he describes how they liked to do an aileron flick roll on short finals in their jets. He lost one of his friends in one such manoeuvre and the investigation revealed a bolt had been fitted the wrong way around and had jammed the aileron.
All in the name of preserving astronomical executive salaries.