Many years ago as a teenager, and new to fishing, I was in France on a family holiday at a place called Cascade du Sautadet, basically a series of waterfalls, pools and bigger river like expanses of water, and very popular with tourists as it was an unusual place to swim.
I'd recently obtained - perhaps even on that holiday - a beginners 7ft fibreglass spinning rod and some other bits and bobs like floats perhaps brought from England in anticipation of finding somewhere to fish. I was fascinated by fishing as I'd seen people catching tench at my local lake, but had no family members or mentors so was totally clueless, but undeterred. I don't think I'd ever caught a fish at that stage.
The family had found a fairly secluded spot for lunch, and a few footsteps away was a probably 20x20ft sort of massive rock pool - hard to explain but a kind of nearly closed off rocky area with presumably reasonably deep water below and high rocky walls, joining onto other pools. I think i had a little insert waggler on, probably quite strong line, and a large ish hook.
Bait was literally a folded over piece of ham from someone's sandwich. I dropped in the bait with, presumably, no idea of the depth or with no expectation whatsoever of catching.
I don't even remember waiting that long and the float buried and I struck into something ridiculous. As I had no experience of catching anything at that point it would be foolish to make any bold claims, but the rod bent double instantly. The fight probably only lasted 5 seconds before the line snapped.
For a first fish this was quite the experience, not to be matched for some time if ever in terms of the sheer "WTF" of it all.
The venue definitely contained chub and barbel so I guess it was one of those - I'd like to think a pretty massive one!