I was making up a new radio box for my P2W yesterday (putting a PMR vehicle radio into a Peli case with antenna that'll go on my top box rack, to remove battery limitations and give better comms range compared to a handheld on my belt) as I couldn't fit one under the seat as I did on my last bike. Got to the point of being ready to solder the Peltor/Nexus headset jack on the cable (having remembered to slide the cable shell onto the cable first, not going to catch me out again with that rookie error), when I realised I couldn't find the crimp ring that acts as strain relief and holds the cable to the jack. So a look around, including moving the radio box and a few minutes later found the crimp ring on one side of the coffee table I was working on - carefully put to the side so I wouldn't knock it off and lose it.
So I went back to the radio box, and now couldn't find the shell I'd just put on. A good fifteen minutes of looking inside the box, inside my tool boxes, under the sofa, everywhere - including getting MrsH to help. Disappeared. So eventually I gave up for the afternoon and checked what availability was for a replacement (they'd been out of stock for ages at Mouser, but there they are "only" £19 each, compared to almost double anywhere else). When MrsH went to bed I thought I'd have another look, and found it in 5 seconds under the sofa where we'd both looked multiple times
The other slightly odd thing was that I found it before, not immediately after, ordering a replacement.