Boilermaker

Four friends sat over their boilermakers, a lively banter between two: "Is it about knowing, or more about remembering? Because, we already know stuff. Just have to remember that we know.", the first one says with a note of assured certainty.

"Know stuff. So, what do I know?", the second one asks, sipping off his shot.

"You know the angriest dog in the world is chained all day and night to a damn pole. So then, what do I know?"

The third friend says "You know that cute girl winking means there's a young dude behind you!" All laugh outloud, except the fourth friend, staring into his beer that's going flat. "Know things. Just remember. I know my wife sleeps with my neighbor- don't want to remember- I do, all day long."

The four friends just sat in silence. There would be one more round.