Have you ever used this activity in classroom ? Concerning a specific content, groups invent themselves a number of questions for a quiz. The members of the other group(s) then have to take the quiz ; the group that invented the
hardest quiz is the winner.
I really like that activity because it is a nice active way to work on factual knowledge content.
In Moodle, this could be realized by using a plugin that allows glossary entries export to quiz - I saw there used to be such a plugin (it generated multiple choice using random answers). There is a developer (see this discussion) who could propose that... that's why I came here to see if anybody's interested