Two Line Vocabulary was a game played on the American edition of Whose Line.
The game required three players. The first could say anything, while the other two were given two lines each to say - generally inappropriate for the circumstances. A scene would then be acted out with the straight man (usually Colin Mochrie) attempting to move things forward in spite of the handicaps of his co-performers. Ryan Stiles proved particularly adept at this game, being able to vary the emphasis of his lines to achieve different effects and to find ample opportunity to use comparatively one-off lines (like "When's lunch?" or "Should I use my gun?").