Perhaps an illustration of a transaction occurring simply, directly, rapidly, and with a tiny fee compared to one requiring trips to the bank at both ends, forms to fill out, taking several days, passing through several intermediary financial organizations, and costing several expensive fees along the way. Cruft-free transactions are one of primary distinguishing characteristics of Bitcoin, right?

But then when addressing the negatives, follow that up with an illustration of the current process to obtain Bitcoins.