Saboteur Chain Reaction (Con)

This game is described by Tyger (for 1998 Con) and credited to Al Desuda

The players were divided into 2 teams. When it was team A's turn, there would be 2 givers and 1 receiver from team A, but the word would be chosen by a member of team B who would provide every third word. After the number of players dwindled, play just shifted around the table, with one receiver, and 2 good givers plus one saboteur who chose the word. The receiver knew who the saboteur was, but the constraint of forming a grammatically correct sentence could throw off the 2 good-guy givers pretty badly. Fortunately the sentences did not also have to make sense.