WOW! What amazing and wonderful news! Ideas:
1. Get someone to dress up as the publisher's clearing house and come to your door with balloons (this would be a lot of effort but funny)
2. I like the monopoly money idea
3. Casually mention some financial goal yall have (paying off a car, loan,debt, reaching a % of e-fund) and just say "Oh yeah, I'll take care of that on Tuesday"