Ok, how's this. First match in 30 years. Thought I was ready but knew it would be slow. Practiced mag changes but didn't think about changing with retention in IDPA. Let a mag with ammo fall on the ground with a round in it on a tactical reload. Left it there. Then I found out that a mag I was using was bad and had a double feed on an Officer's ACP (Shooting CCP). Did I react immediately, no. Just stared at it for a couple of seconds. Duh!
Then on to another stage. Picked up speed, good shots, FTE. Stared at it for a couple of seconds. Double Duh!
Didn't end up at the bottom but not far from it.
Moral of the story: practice and check your equipment. Better than Duh!