Lock problems...
On Monday, I arrived at work to find I'd not got my D-lock (I'd swapped it with my cafe cable lock for the Sunday ride, as I anticipated parking in the neighbouring town, and remembered starting to swap back, but assumed I'd distracted myself and put it down before getting as far as the saddlebag).
No immediate problem, I've got a light combination cable lock for just that circumstance, and the bikes are in an ID badge controlled cage anyway.
Put in combination, lock didn't open. Tried possible alternatives, lock still didn't open.
Picked up suitable abandoned chunky cable lock, wrapped it around the bike so it looked locked to a casual glance, and went in to work.
During the morning, during the intervals where I was waiting for the PC to finish doing things, I started the possible combinations, starting at 0000 and progressing upwards. After I'd got as far as 0895, I realised I'd been lining the numbers up in the wrong place, and I had correctly remembered the combination after all.
So at lunch, I decided to go back home and get the proper lock.
Searched the house, not there, so I picked up the anchor chain instead, and set off back.
As I was riding along, I remembered a clunking noise where I'd ridden through the pile of dead leaves covering a cycle bypass to a no entry junction, so I stopped, dug about a bit, and found the missing D-lock.
I did think afterwards that if I hadn't remembered and searched, I might have caused myself to crash when I hit the hidden lock the next morning (or, indeed, any other cyclists, though I suspect that most would avoid the pile of leaves and just ride through the no entry sign).