The ideal circumstance would be to take out a loan you can’t really afford immediately before a round of hyperinflation. Bad time to have $100K in a savings account. Great time to owe that bank $2M.
Outside of the standard theme park with blackjack and hookers, you could pick up a race horse. Those can start in the low six figures up to tens of millions. Although if you want to race, do not blow the entire amount on just the horse, because the training + food + maintenance is also going to have some hefty bills.