Again... <G>

The saying "the buck stops here" derives from the slang expression "pass the
buck" which means passing the responsibility on to someone else. The latter
expression is said to have originated with the game of poker, in which a marker
or counter, frequently in frontier days a with a buckhorn handle, was used to
indicate the person whose turn it was to deal. If the player did not wish to deal he could pass the responsibility by passing the "buck," as the counter came to be called, to the next player.

Dang if I can't remember some of the strangest things, that might have never existed sometimes? Where did I ever get that buck knife used as the marker. Buckhorn handle knife... OK I give.