As in: I hit F6, "Do you want to reboot this?" dialog pops, I hit 'Y', "Do you really really want to reboot this?", I hit 'Y' again.
Instead of actually reading what it says, you just instead press F6-Y-Y in quick succession.
Modern interfaces sometimes make you type some kind of string to confirm, but most either use a password (like sudo) or some hardcoded string that everyone eventually memorizes.
But even today, Windows 7 only makes you click that one button in UAC, and most people probably do it without even thinking about it.