The London-based group Technology Will Save Us features the human circuit game for kids. Using low-tech stuff, kids simulate sending electrons (such as pieces of fruit or clothes pins) through a human “circuit”

There’s a handy “instructions” sheet and printable resources for the circuit including batteries, switches, lightbulbs, and so forth. Although this is useful for a classroom, could you make it work at a kids birthday party in some form of “pass the parcel”?