Hi,
what's about the possibility, to implement a "joker-feature" for the quiz like in "Who wants to be a millionaire?" It would definitively increase the fun-factor for non professional quizzes, which are not meant for checking any learning process.
Jokers could be:
50:50 (Remove two wrong answers)
80% Chance (Chance of the hint to be correct answer is 8 to 10)
Substitude question (simply discard the question and take the next one)
Telephone joker is somehow difficult to implement
Each Joker can be used once in a quiz.
Example:
www.volker-quaschning.de/quiz/index.php