It's been long enough ago now that it is beginning to be humorous, so here goes:
For reasons I have long ago forgotten, I had cleaned all my brass in Lyman Green Cob with NuFinish. This invariably results in almost every case having from one to many particles of cob wedged into the primer pocket and flash hole so over time I realized it was faster to run all of them through a Lee Universal Decapper than to inspect each one and poke out the little bits of cob. This particular time I had procrastinated more efficiently than usual and found myself performing this task while supper was cooking because the BPCR match was the next morning. As usual, a few kernels of cob ended up in the loading blocks causing some of the cases to sit crooked. I whipped out my Lee Autoprime and discovered that it had only a couple of WLR primers in it and that the brick I had been working out of was empty. So, I began excavating the case of WLR primers from the stash. About that time supper got ready and I closed the door to the reloading room and went upstairs. As frequently happens at the end of the day, the Honey-Do List had a job for me after supper. When I finally got back to the reloading room, I proceeded to charge the 60 cases and compress the powder and noted sort of in passing that there was more "stuff" getting caught in the grease ring building up at the top of the press ram. But, it was now well past midnight and I still needed to seat and lightly crimp these then get them into the range box so I could go to bed. When I began to transfer the loaded rounds into the MTM bullet down boxes it was apparent that I had primed only the first half dozen cases and that the remainder of my match brass was filled with compressed black powder and crimped onto very soft boolits. I could barely stay awake at the match and iron sights might as well have been covered in electrical tape. I have since changed my cleaning media and put the primed cases back into the loading block upside down so I can SEE that they are primed. Short term memory isn't what it used to be.