Requirements
Enough index cards for each member of the group
Objective
To find the person that has the punchline to fit your joke or the joke to fit your punchline.
Description
Set-up: Write a joke on one card and a punchline on another. Be sure to mix the cards up. The number of different jokes you use is up to you.
Give each person a card. Explain that they may have a joke or a punchline on the card. On a given signal, they are to walk amongst the crowd trying to find the other part of their joke/punchline.
When they find their other half, you may ask them to get to know their new partner by asking things like favorite ice cream or dream vacation, etc.
When this is done, everyone can return to a circle and, with their partner, tell their joke to the rest of the group.