Inconvievable!

Topless Robot held a contest for "Most Helpful RPG Chart". THIS LINK has some of the best, and here is a personal favourite:

by Bombadilly 
You've met a picnicking Sicilian and death is on the line...
01-15 - Treat him as a great fool. Put poison into his goblet
16-31 - Don't treat him as a great fool. Put poison into own goblet
32-47 - He won't trust you. Put poison into own goblet
48-63 - He'll know you can't be trusted. Put poison into his goblet
64-79 - Be strong! Put poison into own goblet
80-95 - Study mortality. Put poison into his goblet
96-100 - Start a land war in Asia