All ideas

Party plan

Impractical Invention Expo

Build prototypes for problems that absolutely did not need solving.

6–15 people75 min prep

Teams receive a box of simple craft materials and a ludicrous problem, then construct a nonworking prototype. The goal is clarity and comic ingenuity—not power tools or real engineering.

Before guests arrive

  • Write absurd problems that can be represented without a working mechanism.
  • Sort safe craft materials into equal team kits.
  • Set up an expo table with product-name cards and visitor voting dots.

The three moments

1

Assign needless problems

Try prompts like keeping one sock warm, applauding silently, or transporting exactly three grapes.

2

Build the prototype

Limit teams to the shared material table and forty minutes. No blades, heat, or working electronics required.

3

Open the expo floor

Teams demonstrate their models while visitors leave investment dots and one-sentence product reviews.

Host-ready schedule

Your run of show

0:00

Form teams, draw problems, and review the safe-material boundary.

0:10

Give teams forty minutes to build and prepare a demonstration.

0:50

Open the expo for rotating pitches and visitor questions.

1:10

Count investment dots and read the best one-sentence product reviews.