My senior year of high school, biggest day of my career to that point, my coach tells me that he wants to move me from anchor to 1st leg on the 4 x 800m, because the 1600m was moved up in the program, and he wanted to get me another few minutes of rest.
I had never ran 1st leg, and wasn't happy about it, but agreed. In a fit of idiocy, I went out with this multiple state champion 400/800 type guy, and heard 52, 53, 54 as we came through 400. I felt fine, but knew I was in for a world of hurt at that point.
Next thing you know, with 100m left, I must've stepped into the lane with quicksand in it, because my legs just weren't operating properly.
I ended up passing the stick at 1:59, so basically must have wobbled in the last 50.
I remember sitting under a tree with an ice pack on my head. Then the 1600m was just a survival contest, with no legs under me from the gun. I wish we just stuck to the plan and ran the anchor as usual. I regret it to this day.
To top it off, I got 6th place in the relay, so for all that misery, I got a pink ribbon of all things.