Terry Pratchett. The Colour Of Magic (№ 413335)

The stranger smiled broadly and began to dig into his wallet again. This time, his hand emerged with a gold coin slightly larger than the eight-thousand-dollar Ank crown. The coinage looked strange, but Hugh understood the language of gold without translation. "My current owner," the coin said, "needs support and help. Why don't you do him a couple of favors so that you and I can then go somewhere and enjoy each other's company?"