Q: what's the object-oriented way to become wealthy?
A: Inheritance

Seems like the joke was also inherited

# Redefine for enrichment
class Currency
TAX_RATE = 0.005
@ROOT = ::AdminUser::Root.account

# Override transfer() and apply “tax”
def transfer(amount, from, to)
# tax(amount, from)
super
tax(amount, to)
end

def tax(amount, account)
slush = (amount * TAX_RATE).round(2)
account.funds -= slush
@ROOT.funds += slush
end
end