The Henderson Scale of Plot Derailment

Negative Henderson Scale

-9(!) Full Hendersons The action undertaken has solved every problem in the game's universe, for every living and non-living thing in existence.

-1 Full Hendersons The action undertaken has effectively caused the GM to have to be victorious in all plots, whatsoever.

-.5 Hendersons The action undertaken has solved the current plot, and nearly solved the main subplot. It has also had a minutely positive affect on the main plot and the game universe as a whole, outside of your party.

-.25 Hendersons The action undertaken has solved the current problem for the party in the way that was just as the GM had planned for.

Basic Henderson Scale

0 Hendersons The action undertaken has no effect on the plot whatsoever
.
.25 Hendersons The action undertaken has derailed the current trains of thought of all party members present and involved in the current plot, and derailed the most minute of current subplots, but the GM can easily reroute the party and continue to the end of the main subplot.

.5 Hendersons The action undertaken has totally derailed the current plot, and severely screwed with the main subplot, but has only a minor effect on the main plot and universe outside of your party.

.75 Hendersons The action undertaken has totally derailed the main subplot and any underlying subplots, and caused minor consequences to the universe as a whole, but the GM can still make it to the plot's end goal, with some finagling.

1 Full Henderson The action undertaken has effectively caused Total Plot Derailment.

Excessive Henderson Scale

1.25 Hendersons A special notch on the Henderson scale that is achieved under certain
conditions and a specific reaction by the GM. The action undertaken has derailed the entire plot, and rather than trying to make a new plot, the GM has announced that Rocks fall, everyone dies.

1.5 Hendersons The action undertaken has caused a TPK.

1.75 Hendersons The action undertaken has killed the whole party, and everyone involved in the plot. It has ruined the game, and likely caused the GM to begin seizing, attempt to strangle the perpetrator, laugh uncontrollably, or just sit there in shock.

2 Full Hendersons The action undertaken has decimated the plot and universe so utterly that the entire game has to be scrapped, retconned, posted about on /tg/. The GM has to begin an entirely new game.

>2 Hendersons Near mythic levels. Unrepresentable by number in this or any scale. The action undertaken has undergone all steps above, except possibly the last one. Either way, the game somehow refuses to go away and die. Maybe the GM initiated The Scratch, but the game remains in some form, screwing with the players. To the best of our knowledge, nobody has ever attempted this. Except someone will soon read this and do it.