“I changed my mind!”

Certain players try to “take
back” actions when they suffer bad
consequences. Don’t let them do it
unless they could realistically have
changed their minds in time to avoid
trouble.
If George says, “I’m dropping the
nitroglycerine,” and you roll the dice
and tell him, “It just blew up. Take 3d
damage,” George can’t take it back.
But if George says, “I’m setting fire to
the building,” and then changes his
mind – let him. “All right. You lit the
match and found some newspaper,
but then you changed your mind.
Stomp out the newspaper.” Buildings
don’t burn that quickly, so George had
time to reconsider. (If George had
used a flamethrower, of course, it
would be different!)
In general, if a player announces
that he is performing an irrevocable
act . . . he really did it, and that’s that.