Our group came up with an impromptu house rule for using the Yes/No Probability Matrix in Captain’s Log: use it like a Clock in Powered by the Apocalypse games. You start with a given probability and each time you find the need to check if the event happened or not, the clock goes up a row. So in our game we had an injected serum that made our bodies mimic the appearance of the local alien race. When we first beamed down, we deemed it was ‘Improbable’ that the serum would fail for one of our party. Each subsequent scene the clock would tick down (moving the arrow up) so the next scene we rolled against ‘Somewhat Improbable’, and the next scene we rolled against ’50/50′ until a scene happened where someone’s serum finally failed (at a most inconvenient moment of course). I will definitely be using this rule again.

The fateful scene when the serum failed was Scene 4 in a write-up I did of the adventure here.