Step 1 - Talk about what makes people happy/sad etc.
Step 2 - Break your class into groups of no more than 5.
Step 3 - Give each student one minute to think of and write a question.
Step 4 - Students give their page to the next student in their team.
Step 5 - They answer the question and write a new one.
Step 6 - Repeat till the sheet gets back to the original owner.
Finish the activity by reading some of the answers and getting the class to guess who wrote them.