In Squares, use a suggestion that isn't on the list.
In Bounce, shrink the paddle to the smallest size.
In HiLo, all players incorrectly guess the final question.
In HiLo, guess the highest ranked answer while trying to guess the lowest ranked answer.
In Speed, reveal all top ten answers.
Guess "Jackbox" as an answer on any list.
Guess the secret word as an answer on any list.
Play an entire game without revealing anything on a list