The video of Nixon making the announcement would be my first go to.

Afterwards I would ask them to go to a bank and ask for a $100 bill to be converted into gold.

See how they respond. Might be a fun idea for a youtube video nostr:npub1lelkh3hhxw9hdwlcpk6q9t0xt9f7yze0y0nxazvzqjmre3p98x3sthkvyz