About a decade ago I had a brown I'd estimate in the 20" class swing downstream, position herself in seam no more than 10' from me, and begin rising to sulphers. (below Benner on Spring, so possibly an escapee, but you don't think clearly in the moment)
Sh*t myself so bad that I fumbled with my chest pack switching flies and somehow managed to knock my displayed license off, with a nice SPLAT on the water. Needless to say, that spooked her before I got a cast in.
I've not displayed a license since, and have never been asked to provide proof in a couple dozen days on the water I've fished each year.