I can't remember what the site was .. but this was pretty cool! First, someone gives a movie title. The next person uses that movie title to create a family. Here's an example: The Breakfast Club.
DH: TH
DW: EB
DD/DS: RE / AK
DS: FA
DD: ST
DS/DS: CL UB
If you have an extra letter left over, either give your last child 2 middle names; create a new child with only a first name; or create a pet!