If I was going to write a list,
1 - always tramp about holding your fly rod so the tip trails behind, not extended in front, otherwise you will become familiar with the first names of far too many customer service rep's.
2 - do not fish in the river section known as Rattlesnake Canyon
3 - when fishing on reservation waters, do not call anyone Chief
4 - when the high end fly rod you ordered arrives, look bewildered and tell your wife 'honey, I've been swindled, someone replaced the jewelry I bought for you with some lousy fishing gear'
5 - when someone shows up and wades into the river right where you were finishing your swing, give out a crazy laugh and yell loudly 'bro, I've got some great f'n speed that I just scored, want a hit?'
6 - never fish with someone who loads a case of beer into the back when just fishing for the day
7- when you're slamming the lake fish using Squirmy Worms, and the flyfisher in the boat over asks what you're using, tell them a Zebra midge.
8 - when float tubing a nice hatch, and a houseboat shows up and drops anchor too damn close, with country music blaring and Power Bait slinging, kick away quietly, they are assuredly better armed than you.
9- do not let the fly shop counter guy talk you into buying size 22 midges, they will just ride around forever in your fly box without ever being used
10- Always de-barb your hooks, your ear lobes will appreciate it as much as the trout do