In the 70's, when I first started fly fishing, I was wet-fly fishing a section of the Dyfrdwy (Little Dee) that flows into the SW end of Bala Lake. It was a nice day, I was on a Bala Anglers day ticket, and I was the only angler on the river. I was fishing with some measure of success and wanted to fish to where the river emptied into the lake and then pack up.
I had fished down a lovely glide and the next section looked really promising until I reached that dreaded apparition, a Prince Albert Angling Society board on a post! They had a short section, of about 200m, right in the middle of the Bala water. Marvelling at the close proximity of Macclesfield to Bala, and my lone status on the river, a well-aimed boot dispensed with the sign, on its somewhat rotten post, and I fished on to the lake. Returning to my car I launched the good ship HMS PAAS on her maiden voyage to the Irish Sea.
Nowadays I would never dream of doing anything like that (as the b***ards put them up trees where you can't reach). To any members of that organisation, that has so much water that they probably have the fishing rights to my garden pond, I am apologetic but unrepentant!