Big Red Button

If you're not supposed to press it, why does it exist in the first place?

The button that causes a bunch trouble when pressed. Pressing the Big Red Button is something similar to opening the Godless Third Drawer Of The Demon Nightstand but on a much smaller scale. Usually comes with "Do Not Press" label, giving the reader a good piece of advice, but since they're just so stupid, they'll say "I'll be damned if I take order from an inanimate object", press the button they well know they shouldn't, and get what they deserve. The "button" does not have to be a literal button, nor does it need to be red; it just needs to be a device that obviously shouldn't be interacted with or else bad things will happen. Like All Just A Dream, Big Red Button is criticized for being overused in fiction and acts as a terrible, lazily-written plot device, which is a bit funny as it's an actual device.