I used to read Adbusters for years, and that was the start of Buy Nothing Day. They tried to buy a prime-time commercial spot for like 50 grand(?) and once the stations saw what they were trying to “advertise”, they pulled the commercial and the price for a 30 second spot jumped 10 fold.

The amount of damage it would cause if a reasonable amount of people partook in that day, would be striking

Hands down cribbage. I know a board is involved, but also doesn’t need to be. Still a great game