When one has fished over many years there will be some 'peculiarities' among the experiences one has had and I will tell you about some of them:
We are at the start of October 1970 - as a Vet. in a partnership we had an agreement: Were there not much to do then one of us could take free the rest of the day, and as a result of this and as the weather was perfect I drove up to the upper reaches of Simested aa (aa is the name of a danish stream - we are not so sufisticated to have any rivers), where I had planned a meeting with an old friend of mine - a brown trout around 1½ pound in weight. I had 'missed' him a few days before and would see if I could persuade him to take one of my new tied flies inspired by Joseph Keen's book "Fluorescent Flies". Hook Mustad 72505 # 16. Hackle and tails taken from one of my Blue Bantam Wyandotte cocks. Body: Phosfor-Yellow DRF floss (Depth Ray Fluoriescent) covered with clear monofile nylon dyed in Picric acid. The trout were rising and I got on my first throw a nice rainbow of over a pound. Further up my old friend was active and he took the fly the first time it passed over him. This time I hooked him and after my bitter experience I kept my rod high and pressed him up.
After 'some dicussions' he ended in my net and then I saw the reason for my earlier failures:
He had missed his upper jaw on the left side and by this, there was a whole gap.

Another day the next year I was fishing at my other favorite stream, Binderup aa, together with two friends - Hans Møller, one of the first Danes to fish earnestly with a dry fly, and a Swede, Kenneth Boström. At that time the meadows were 'running' straight to the shore of the stream and by this it was perfect for 'cross-country casts' - one could be placed flat on ones bossom a distance from the shore and let the cast go low over the grass, cross the stream and end upstream near the other shore where most of the best trout were situated. A trout was rising steadiky like a metronome and we
crawled forward - one after the other - to have our chance with the trout - but he neglected every presentation. First after a long while, then we wanted not to frighten him with the shadow of our line and cast to pass over him, one of us made a too long cast in over the trout, and he took the fly promptly. Reason to all our failures: He was blind on the eye to our side. He was in perfect condition and we let him free with many thanks.

Once more at the upper stretch of Siemested aa I had in one way or the other broken my hook at the bend - I observed it first after some trout had taken the fly and I missed to contact them. I cut it off my cast and throw it into the stream. In the afternoon I returned to the same place and caught a nice trout, which I killed and took with me. At home I cleaned it and I inspect always the stomach content in water in a white saucer - and what do I find among all the other things - my broken hook!

Kneeling low among the high sedges on the lower stretch of Simested aa I was fishing a riffle; but after a few casts I hang fare back and not wishing to disturb the rising trout I broke the cast and mounted another fly of the same pattern. Once more after a few casts I hang and now I did not
want to loose another fly, so I crawled back along the line, found the fly in a leaf on a bush; but a few cm from it hang my other fly!