I think I've seen a couple of their videos, and have no idea which of them Adam would be (can't even call any faces to mind right now to be fair), so I'm pretty sure those phrases are in my head from elsewhere.

The "Please stop" is pretty generic, but got a lot of traction that time Hyperbole and a Half told a story involving it. "Hey! Quit it!" is probably Lisa or Bart from some episode of The Simpsons. "Stop it! NOW!" is probably something that was actually said to me at some point as a kid.

Never got shot though, so I must have started behaving at that point.

(For legal reasons, that last part is meant to be tongue-in-cheek. I am also using "for legal reasons" mostly humorously. Mostly.)