I'd add, for example, the very Old School way.....not really in favor of many in the modern day....of rolling for everything on extreme tables with extreme results and always keeping every roll no matter what: no DM or player interference.That is an Old School view, and I respect it, but other schools of thought exist and are just as valid. It's all a wondrous tapestry of opinions and methods, right?
Arrow does crit damage, your character dies.
DM rolls for a random encounter and it is a Planetary Elimination Droid from the 25th century....and it attacks.
The trick here is to have the extreme tables with the extreme encounters on them, not just "fair and balanced encounters".
I love this myself....and so do many of my players as they can encounter anything....not just the same "core monsters in the rulebooks that every GM uses".