There’s a story about sales guys at a company (NewTek?) who faked a demo at CES of an Amiga 500 with two monitors showing the “Boing” ball bouncing from one screen to the next. This was insane because the Amiga didn’t have support for multiple monitors in hardware or software so nobody could figure out how they did it. Turns out they had another Amiga hidden behind running the same animation on the second monitor. When they started them at the right offset it looked believable.