"The gramatical incorrectness of it drives more crazy than the rule itself.

Yes, there IS fishing there, it is just illegal and you don't like it. 
"No fishing allowed" - OK
"Please don't fish." - OK
"No Fishing" - Oh yeah? Let me show just how wrong you are. "

"Damn. There are a lot of NO signs in Hawaii."

"Everybody looking cool.."

"Yeah, those dressed up in the gear, that looked hot as hell, hehehe..."

"It looked pretty cool! And very hot"

"I was over with the Ingress Enlightened crew... sort of, my kid was flying his kite so I was helping him do that a little, then I had him on my neck walking around checking stuff out.. "

"I searched but didn't see your face"

"sacred fish. must not be eaten!"

"Throw a line in!"

"Woah! High-density biomass in that water!"

"Yes! The spicy pork was the best."

"Was that raw chicken going by??"

"True!"

"The reflection from the lamp looks like a UFO trying to suck up that car :)"