TOSS: Tales of Significant Situations

From the introduction:

TOSS is a miniature framework for quick stories based on momentary events for a character in a roleplaying game. TOSS can work with any conventional tabletop RPG, but it shines in RPG’s that use skill checks for various actions.

TOSS was designed for use in places where conventional roleplaying is generally not feasible – at the bus stop, at a lunch break, or while watching commercials. It’s a way to create impromptu short stories on the fly. It can be used in a conventional tabletop setting, but is aimed for a solo player looking to add further stories to a favorite RPG or setting when there isn’t time for a whole session.