My own personal one...
In a previous company we would supply mouldings to a UK electronics company (they shall remain nameless)
At the initiation of the contract it was agreed to make one delivery a week against their forward schedule. This we would deliver on the wednesday for them to process and start using for the following week!! Nice and simple.
I would get reams of reject notes for overdeliveries
It took a while, but I worked out what was happening.
The @@@***s were too lazy to look on th epallet for what was wanted and would phone our sales chap (who was extremely helpful) and he would take what they wanted, deliver it on a manual delivery note, and when they finally broke the pallet we had delivered the parts taht were delivered on that were showing as previously delivered.
They flatly refused this situation.
So, I went to visit them, as a response to another complaint (their fault again) and I had discussed where the pallets were delivered with our delivery driver.
When I had beaten them severely about the problem that had originally dragged me down to them, I wandered off to where our deliveries were. And promptly created a rather large disturbance.
I had the Purchasing head, the MD, the QM and the QE all stood in front of me, with the evidence.
Rejection for over delivery did not happen again!! And I had the figures for all the previous rejections removed from our figures. They hated me after that.