1 Charon: Have you a coin for the Ferryman?
2 Prof. Jones: Let's see. I have francs, guilders, marks, escudos, pesetas, lire, zloty, roubles, dinars, dirhams, piastres, rand, rupees, baht, and yen.
3 Prof. Jones: Will any of those do?
4 Charon: <sigh> Do you know how much commission I have to pay to get those exchanged into obols?

Charon was traditionally paid in obols.

He's had to deal with exchange rates for almost the past two thousand years.

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2022-04-17 Rerun commentary: A world traveller like Professor Jones would naturally have a swag of currencies available to suit whatever country he happens to find himself in. The Land of the Dead is a bit of a corner case, though.

I have a small tin in which I put leftover notes and coins from foreign trips, ready to take them with me if I travel back to the place of origin. I haven't counted recently, but I think there's close to a dozen currencies in there.