Years ago I floated a well known river in AK. One of my targets was to catch a class tippet IGFA record Dolly Varden. About half way through the trip I hooked a good one. Landed it and got all my paper work out. Weighed it on my IGFA certified scale and confirmed it indeed was a record. So did all the required things (weight, measurements, and pictures). There was a group floating by that stopped on the gravel bar and a guide came over. Turns out he was a USCG licensed charter captain so he reviewed all my stuff and happily signed off as the witness.
At the end of the trip I get home all excited and run down to the camera shop and turn in my film to have it developed. They called a week later and said my photos were back and I could come pick them up. Headed right down and got them. Opened up the pack and the first thing I see is a note. The note proceed to say that they are sorry and during the development process they had an accident and ruined one of the rolls of film. We are so sorry so here's a coupon for a free roll of film. And of course the ruined roll was the one with the required photos.
No photos, no cigar.
Similar story . Strawberry Lake in Utah . 30" Bear Lake Cutthroat , measured on my license plate on the side of my pontoon boat . Caught it as I was coming in ,probably less than 100 feet from shore . Got it to the net , paddled to the shore ,buddy was already in . Keeping the fish in the water , the story gets even better .Reel comes off my fly rod ,and went to the bottom on the way in . Fish somewhat in the net , being 30" . So here I am ,fish in the net ,wanting as this point to measure ,and get a picture . Pulling in the fly line ,with reel at the bottom , probably around 20 feet deep . I keep pulling line of course it keeps coming off the reel for whatever reason ,and then the backing , must of been a pretty loose drag ,and hung up a bit on the bottom . So here I am ,a lap full of line ,and backing plus the reel . Fish somewhat in the net I am holding on to keeping it in the water ,very surprising this fish was cooperating . Anyway finned to shore , got the fish quickly out of the net ,and measured . My friend he takes a picture ,we quickly take another picture with my phone . Another guy on the shore wanted a quick picture ,it was a big fish .
After all this , fish back into the water ,and worked him for just a few seconds ,and he was off ,and running . Biggest trout I had ever caught, still to this day . Well the story doesn't end there or very well for that matter . I take my phone out once we are in the truck ,and on the way home . I got what looks like a finger picture on my phone , no fish picture . Had his finger over the camera lens . No problem ,the friends got a picture on his phone , well no he doesn't for whatever reason, no picture . Somehow he managed to mess up both phone pictures . Yes, I still fish with him .

Of course the guy on the shore was long gone ,no idea who he was .

So it's just a fish story .
On edit , just for clarification on the 30" as I remember it .

I still have the same license plate I made up for my pontoon boat , so it has been a few years on this cutthroat I caught ,over 10 years , more like 12-15 . Anyway I just went out ,and measured that plastic license plate again that I made up years ago .It measure just over 26", 26*1/4" and as I remember it the fish was a guess on inches longer than the plate , so in my mind all these years it was a 30 incher.

In reality most likely 28-29 " at best . But it was longer than the license plate. It was a big trout . The record caught for the Bear Lake Cutthroat is 31" , so they do get big .