Similar to a well known story I'll attribute to AJ McClane, but this in fact happened.
YNP, 30 years ago, first week in August. My wife and kids let me pull over now and then to fish while they mess around in the grass or something. Buffalo Ford. Maybe the most famous place in the Park, so I gotta wet a line. 2PM, and hot. I pull over, there's a meat line of guys all dressed in the uniform of the day...vest, floppy hat, neoprenes, wading shoes and net. They all look like they just stepped out of the Herters catalog. Nobody is catching shit.
I see an "opening" in line. Off I go in my baseball hat, shorts and carpet-soled tennis shoes, rod, net, and small fly box. To quote George Gobel, these guys are a tuxedo and I'm a pair of brown shoes, but I know enough to know neoprenes are not compatible with a Wyoming summer. I cast out a small soft hackle (that's been catching fish all week) across the current, drift a ways, nothing. A few more times. I still haven't managed to have a hit, but I haven't crossed anyones line, either. Then, whammo. I hook up, about an 8" cutty. Murmuring up and down the line as I release the fish. A few casts later, I'm on again. Release, more murmuring. A refusal rise, which I swear was depth-charged by at least 10 stonefly nymphs before the ring got bigger than 18" in diameter. A little while later, I hook up again. As I release this one, again like an 8" fish, the guy to my left says, "Hey buddy, what are you using?" I rememberd McClane's story, I say, conversational volume, " Coachman, number 12." You can hear fly boxes open up and down the line. Nippers click, boxes shut. The line resumes casting. I step out of line to go back to my family and continue our day.
The guy who was to my right steps out too, and on shore he says..."You were'nt fishing a Coachman.....why'd you tell him that?" I reply: "Everyone has faith in the Coachman."