(a variation on an old party game)
Strips of paper half A4 width, one for each pair in the group. Make (or ask them to) 5 horizontal folds, always in the same direction. Open out and write on the board: When, Who, What, Why.
Explain that in the first fold area each pair should write a past time reference; yesterday or 2 years ago. They should then re-fold the paper so that what they have written is not visible and pass it on to the next pair. They write the name of a person in the next fold area , possibly well-known. Continue passing on and filling in until all done. Collect them in and read them with the group. They are usually hilarious!