Wow, which one, there have been a few. Here is my most frustrating:
I was dragging a Whopper Plopper 130 along a dock that was anchored in the middle of the lake over 20 feet of water. I wasn't really expecting any action when a large fish slurped my bait. The rig I throw the WP on is pretty heavy and loaded with 30 lb braid and the hooks on the lure are heavy, so my drag was buttoned down. The fish thrashed on the surface a couple times and it appeared that she was hooked well. I got her to within 6' of my tube and was planning my landing strategy when the lure catapulted over my head. Bewildered and disappointed, I examined the lure only to find that the belly hook had pulled out of the lure. Epic fail!
That fish still made my day!