Better than bitcoin?! Awesome new currency?

For as long as we all can remember, clients have offered to pay photographers using all manner of currency, other than actual currency! From meals to "exposure" to "covering costs". But recently, a musician was offered something they simply couldn't refuse. Well, actually they did. (Please note extreme use of sarcasm.)

British musician David Hornberg was recently approaoched by someone to hire his "fantastic quartet" to play at a wedding ceremony. The only problem was that the prospective client was not offering to pay for the services, but instead asked if the fee would be waived if they could provide, wait for it, 1000 Facebook Likes and 300 shares. 

Not surprisingly, Hornberg turned the "opportunity" down indicating that he would be unable to pay his rent and bills with the Facebook Likes offered. 

What's the most outrageous "currency" you've been offered for your services?